Arrays Hands-Ons [Java > Arrays] | Accenture TFA Training Pre-Learning Modules

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Make an effort to understand these solutions and apply them to your Hands-On difficulties. (It is not advisable that copy and paste these solutions).

public class Main{
    public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);

        int arr_size = sc.nextInt();
        if(arr_size <= 3){
            System.out.println("Invalid array size");
            System.exit(0);
        }
        int[] arr_int = new int[arr_size];
        int big_diff = 0;
        int small_index = 0;
        for(int i = 0; i < arr_size; i++)
            arr_int[i] = sc.nextInt();
        //if(arr_size % 2 == 0){
            for(int j = 0; j < arr_size - 2; j++){
                if(Math.abs(arr_int[j] - arr_int[j+2]) > big_diff){
                    big_diff = Math.abs(arr_int[j] - arr_int[j+2]);
                    if(arr_int[j] <= arr_int[j+2])
                        small_index = j;
                    else
                        small_index = j + 2;
                }
            }
        //}
        // else{
        //     for(int k = 0; k <= arr_size - 2; k++){
        //         if(Math.abs(arr_int[k] - arr_int[k+2]) > big_diff){
        //             big_diff = Math.abs(arr_int[k] - arr_int[k+2]);
        //             if(arr_int[k] <= arr_int[k+2])
        //                 small_index = k;
        //             else
        //                 small_index = k + 2;
        //         }
        //     }
        // }
        System.out.println(small_index);
    }
}

public class CompatibleArrays 

{
    public static void main (String[] args) 
    {
        Scanner sc=new Scanner(System.in);
        
        //1st array
        System.out.println("Enter the size for First array:");
        int n1=sc.nextInt();
        int flag=0;
        if(n1>0)
        {
            int[] arr1=new int[n1];
            
            System.out.println("Enter the elements for First array:");
            for(int i=0;i<n1;i++)
            {
                arr1[i]=sc.nextInt();
            }
            
            //2nd array
            System.out.println("Enter the size for Second array:");
            int n2=sc.nextInt();
            if(n2>0)
            {
                    int[] arr2=new int[n2];
                    
                    System.out.println("Enter the elements for Second array:");
                    for(int i=0;i<n2;i++)
                    {
                        arr2[i]=sc.nextInt();
                    }
                    
                    if(n1==n2)
                    {
                        for(int i=0; i<n1;i++)
                        {
                            if(arr1[i]>=arr2[i])
                            {
                                flag++;
                            }
                        }
                        
                        if(flag==n1)
                        {
                            System.out.println("Arrays are Compatible");
                        }
                        else
                        {
                            System.out.println("Arrays are not Compatible");
                        }
                        
                    }
                    else
                    {
                        System.out.println("Arrays are Not Compatible");
                    }
            }
            else
            {
                System.out.println("Invalid array size");
            }
        }
        else
        {
            System.out.println("Invalid array size");
        }
    }
}

Path: JAVA/Arrays/Array square/Array square/Main.java

import java.util.*;

public class Main 
{

    public static void main (String[] args) {
        int i=0;
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        
        int arr[]=new int[n];
        for(i=0;i<n;i++)
        {
            arr[i]=sc.nextInt();
        }
        
        int arr2[]=new int[n];
        for(i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
            {
                if(i!=j)
                {
                    arr2[i]+=arr[j]*arr[j];
                }
            }
        }
        
        for(i=0;i<n;i++)
        {
            System.out.println(arr2[i]);
        }
    }
}

4. Average and Grade Calculation

Path: JAVA/Arrays/Average and Grade Calculation/Student.java

 public class Student

{
    private int id;
    private String name;
    private int[] marks;
    private float average;
    private char grade;
    
    public void setId(int id)
    {
        this.id=id;
    }
    
    public int getId()
    {
        return this.id;
    }
    
    public void setName(String name)
    {
        this.name=name;
    }
    
    public String getName()
    {
        return this.name;
    }
    
    public void setMarks(int[] marks)
    {
        this.marks=marks;
    }
    
    public int[] getMarks()
    {
        return this.marks;
    }
    
    public void calculateAvg()
    {   float sum=0;
        
        for(int i=0;i<this.marks.length;i++)
        {
            sum+=this.marks[i];
        }
        
        average=(float)(sum/(this.marks.length));
        setAverage(average);
    }
    
    public void findGrade()
    {int flag=0;
        for(int i=0;i<this.marks.length;i++)
        {
            if(this.marks[i]<50)
            {
                flag++;
            }
        }
        if(flag>0)
        {
            grade='F';
        }
        else
        {
            if(this.average>=80 && this.average<=100)
            {
                grade='O';
            }
            else if(this.average>=50 && this.average<=79)
            {
                grade='A';
            }
            else
            {
                grade='F';
            }
        }
        setGrade(grade);
        
    }
    
    public void setAverage(float average)
    {
        this.average=average;
    }
    
    public void setGrade(char grade)
    {
        this.grade=grade;
    }
    
    public float getAverage()
    {
        return this.average;
    }
    
    public char getGrade()
    {
        return this.grade;
    }
}

Path: JAVA/Arrays/Average and Grade Calculation/StudentMain.java

import java.util.*;

public class StudentMain 
{
    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        
        System.out.println("Enter the id:");
        int id=sc.nextInt();
        sc.nextLine();
        
        System.out.println("Enter the name:");
        String name=sc.nextLine();
        
        System.out.println("Enter the number of subjects:");
        int n=sc.nextInt();
        int marks[]=new int[n];
        
        for(int i=0;i<n;i++)
        {   System.out.println("Enter mark for subject "+(i+1)+":");
            marks[i] = sc.nextInt();
        }
        
        Student obj=new Student();
        obj.setName(name);
        obj.setId(id);
        obj.setMarks(marks);
        obj.calculateAvg();
        obj.findGrade();
        
        System.out.println("Id:"+obj.getId());
        System.out.println("Name:"+obj.getName());
        System.out.println("Average:"+obj.getAverage());
        System.out.println("Grade:"+obj.getGrade());
    }
}

5. Country wise Population

Path: JAVA/Arrays/Country wise population/Main.java

import java.util.*;

public class Main{
    public static void main(String[] args){
        
        int size;
        Scanner sc = new Scanner(System.in);
        size=sc.nextInt();
        sc.nextLine();
        String[] country_name=new String[size];
        int pop[]=new int[size];
        
        for(int i=0;i<size;i++)
            country_name[i]=sc.nextLine();
        for(int i=0;i<size;i++)
        {
            pop[i]=sc.nextInt();
            sc.nextLine();
        }
        
        int temp[]=Arrays.copyOf(pop,size);
        Arrays.sort(pop);
        
        for(int i=0;i<size;i++)
            for(int j=0;j<size;j++)
                if(temp[j]==pop[i])
                    System.out.println(country_name[j]);
        
        for(int i:pop)
            System.out.println(i);
    }
}

6. Cumulative sum in an array

Path: JAVA/Arrays/Cumulative sum in an array/CumulativeSum.java

import java.util.*;

public class CumulativeSum{
    public static void main(String[] args){
        
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the number of elements");
        int n=sc.nextInt();
        if(n>0 && n<21){
            int[] a=new int[n];
            System.out.println("Enter the elements");
            for(int i=0;i<n;i++)
                a[i]=sc.nextInt();
            int sum=0;
            for(int i=0;i<n;i++){
                sum+=a[i];
                System.out.print(sum+" ");
            }
        }
        else{
            System.out.println("Invalid Range");
        }
    }
}


7. Display Date
Path: JAVA/Arrays/Display Date/Main.java
import java.util.Scanner;

public class Main{
    
    public static void main(String[] args){
        
        Scanner sc = new Scanner(System.in);
        Main obj = new Main();
        
        int num=0,no=0;
        int yr;
        System.out.println("Enter 3 integers for the day of the month, month and year");
        num = sc.nextInt();
        no = sc.nextInt();
        yr = sc.nextInt();
        String suff = obj.extension(num);
        String mont = obj.month(no);
        System.out.println(suff+" "+mont+" "+yr);
    }
    
    String extension(int num)
    {
        String[] suffix = {"th", "st", "nd", "rd", "th", "th", "th", "th", "th", "th"};
        int n = num%100;
        return String.valueOf(num)+suffix[(n > 3 && n < 21) ? 0 : (n%10)];
    }
    
    String month(int no)
    {
        String[] mon = {"January","February","March","April","May","June","July","August","September","October","November","December"};
        return mon[no-1];
    }
}


8. Display array Values in reverse order
Path: JAVA/Arrays/Display array values in reverse order/Main.java
import java.util.Scanner;
public class Main
{
    public static void main(String[] args) 
    {
        int n, res,i,j=0;
        Scanner s = new Scanner(System.in);
        System.out.print("Enter the array size \n");
        n = s.nextInt();
        int array[] = new int[n];
        int rev[] = new int[n];
        System.out.println("Enter the values");
        for( i=0; i < n; i++)
        {
            array[i] = s.nextInt();
        }
        for( i=n;i>0 ; i--,j++)
        {
            rev[j] = array[i-1];
            System.out.println(rev[j]);
    
        }
    }
}


9. Display array values
Path: JAVA/Arrays/Display array values/Main.java
import java.util.Scanner;

public class Main
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter the array size");
        int n = in.nextInt();
        
        int arr[] = new int[n];
        System.out.println("Enter the values");
        for (int i = 0; i < n; i++) {
            arr[i] = in.nextInt();
        }
        
        long sum = 0;
        for (int i = 0; i < n; i++) {
            System.out.println(+ arr[i]);
        }
    }
}


10. Duplicate an element
Path: JAVA/Arrays/Duplicate an element/DuplicateElement.java
import java.util.*;

public class DuplicateElement{
    public static void main(String[] args){
        
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the size of an array:");
        int n=sc.nextInt();
        if(n>0){
            int[] a=new int[n+1];
            System.out.println("Enter the array elements:");
            for(int i=0;i<n;i++){
                a[i]=sc.nextInt();
            }
            System.out.println("Enter the position of the element to be replicated:");
            int k=sc.nextInt();
            if(k<n){
                a[n]=a[k];
                for(int i=0;i<=n;i++){
                    System.out.println(a[i]);
                }
            }
            else{
                System.out.println("Position is greater than the size of an array");
            }
        }
        else{
            System.out.println("Invalid array size");
        }
    }
}


11. Find Average Age
Path: JAVA/Arrays/Find Average Age/Test.java
import java.util.*;
import java.text.DecimalFormat;
public class Test 
{   
    
    double calculateAverage(int[] age)
    {
        int len=age.length;
        double sum=0.0;
        for(int i=0;i<len;i++)
        {
            sum+=age[i];
        }
        double avg=sum/len;
        return avg;
    }
    
    public static void main (String[] args) {
        Scanner sc =new Scanner(System.in);
        Test obj=new Test();
        
        System.out.println("Enter total no.of employees:");
        int n=sc.nextInt();
        int flag=0;
        if(n>1)
        { int[] age=new int[n];
            System.out.println("Enter the age for "+n+" employees:");
            
            for(int i=0;i<n;i++)
            {
                int temp=sc.nextInt();
                if(temp>=28 && temp<=40)
                {
                    age[i]=temp;
                }
                else
                {
                    System.out.println("Invalid age encountered!");
                    flag++;
                    break;
                }
            }
            
            if(flag==0)
            {   DecimalFormat df=new DecimalFormat("####.00");
                System.out.println("The average age is "+df.format(obj.calculateAverage(age)));
            }
        }
        else
        {
            System.out.println("Please enter a valid employee count");
        }
    }
}


12. Find_Display the position of a number
Path: JAVA/Arrays/Find _ Display the position of a number/Main.java
import java.util.Scanner;

public class Main
{
    public static void main(String args[])
    {
        
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the array size");
        int n=sc.nextInt();
        System.out.println("Enter the values");
        int[] arr=new int[50];
        int i;
        for(i=0;i<n;i++)
        {
            arr[i]=sc.nextInt();
        }
        System.out.println("Enter the number to find");
        int f=sc.nextInt();
        int flag=0;
        for(i=0;i<n;i++)
        {
            if(f==arr[i])
            {
                flag=1;
                break;
            }
        }
        if(flag==1)
        {   i=i+1;
            System.out.println(i);
        }
        else
        System.out.println(0);
        //Fill the code here
    }
}


13. Find the player Details
Path: JAVA/Arrays/Find the Player Details/Main.java
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		
		Player[] pObj=new Player[4];
		pObj[0]=new Player(146,"Athul",16,9876543210l);
		pObj[1]=new Player(135,"Rakshana",16,9956231045l);
		pObj[2]=new Player(168,"Christy",16,9856471230l);
		pObj[3]=new Player(194,"Athulya",16,9768541230l);
		Scanner sc=new Scanner(System.in);
		// Invoke the method findPlayerDetailsById in the PlayerUtility class and display results
		System.out.println("Enter the id to be searched");
		int n=sc.nextInt();
		PlayerUtility p=new PlayerUtility();
		Player r=p.findPlayerDetailsById(pObj, n);
		
		if(r!=null){
		    System.out.println("Name:"+r.getPlayerName());
		    System.out.println("Phone number:"+r.getPhoneNumber());
		}
		else{
		    System.out.println("No player found");
		}
	}
	
}

Path: JAVA/Arrays/Find the Player Details/Player.java
//Don't change the code

public class Player {

	private int playerId;
	private String playerName;
	private int age;
	private long phoneNumber;
	public int getPlayerId() {
		return playerId;
	}
	public void setPlayerId(int playerId) {
		this.playerId = playerId;
	}
	public String getPlayerName() {
		return playerName;
	}
	public void setPlayerName(String playerName) {
		this.playerName = playerName;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public long getPhoneNumber() {
		return phoneNumber;
	}
	public void setPhoneNumber(long phoneNumber) {
		this.phoneNumber = phoneNumber;
	}
	public Player(int playerId, String playerName, int age, long phoneNumber) {
		super();
		this.playerId = playerId;
		this.playerName = playerName;
		this.age = age;
		this.phoneNumber = phoneNumber;
	}
	
	
	
	
}

Path: JAVA/Arrays/Find the Player Details/PlayerUtility.java
public class PlayerUtility {

	public Player findPlayerDetailsById(Player[] arr, int playerIdToSearch){
	
	//Fill the code here
		for(int i=0;i<arr.length;i++){
		    if(arr[i].getPlayerId()==playerIdToSearch){
		        return arr[i];
		    }
		}
		return null;
	}
	
	
}


14. Find the highest mark
Path: JAVA/Arrays/Find the highest mark/Highestmark.java
import java.util.Scanner;

public class Highestmark{
    
    static int findMax(int arr[], int low, int high)
    {
        int max = arr[low];
        for(int i=low; i<=high; i++)
        {
            if(arr[i] > max)
                max = arr[i];
        }
        return max;
    }
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        int arr[]= new int[6];
        for(int j=0;j<6;j++)
        {
            arr[j] = sc.nextInt();
            if(arr[j]<0)
            {
                System.out.println("Invalid Mark");
                return;
            }
        }
        System.out.println("Highest mark is "+findMax(arr,0,5));
    }
}


15. Generate number using odd digits
Path: JAVA/Arrays/Generate number using odd digits/Generate number using odd digits/Main.java
import java.util.Scanner;
public class Main
{
    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the size of an array:");
        int n=sc.nextInt();
        if(n>0)
        {
        
        int arr[]=new int[n];
        System.out.println("Enter the array elements:");
        for(int i=0;i<n;i++)
        {
            arr[i]=sc.nextInt();
        }
        
        String output="";
        
        for(int j=0;j<n;j++)
        {
            if(arr[j]>=0&&arr[j]<10)
            {
                if(arr[j]%2!=0)
                {
                    output=output.concat(String.valueOf(arr[j]));
                }
            }
        }
        if(output.equals(""))
            System.out.println("Single digit odd number is not found in the array");
        
        else
            System.out.println(output);
        }
        
        else
        {
            System.out.println("Invalid array size");
        }
    }
}


16. Highest Mark in Each Semester
Path: JAVA/Arrays/Highest Mark in Each Semester/HighestMarkPerSem.java
import java.util.Scanner;

public class HighestMarkPerSem{
    public static void main(String[] args){
        
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter no of semester:");
        int n=sc.nextInt();
        int[] a=new int[n];
        int flag=0;
        for(int i=0;i<n;i++){
            System.out.println("Enter no of subjects in "+(i+1)+" semester:");
            a[i]=sc.nextInt();
        }
        int[] max=new int[n];
        for(int i=0;i<n;i++){
            int mx=0;
            int[] b=new int[a[i]];
            System.out.println("Marks obtained in semester "+(i+1)+":");
            for(int j=0;j<a[i];j++){
                b[j]=sc.nextInt();
                if(b[j]<0 || b[j]>100){
                    flag=1;
                    break;
                }
                if(mx<b[j])
                    mx=b[j];
            }
            if(flag==1){
                break;
            }
            max[i]=mx;
        }
        if(flag==0)
        for(int i=0;i<n;i++){
            System.out.println("Maximum mark in "+(i+1)+" semester:"+max[i]);
        }
        else{
            System.out.println("You have entered invalid mark.");
        }
    }
}


17. Interchange the elements of an array
Path: JAVA/Arrays/Interchange the elements of an array/InterchangeArray.java
import java.util.Scanner;

public class InterchangeArray{
    
    public static void main(String[] args){
        
        Scanner sc = new Scanner(System.in);
        
        int Size1,Size2, i ;
        
        System.out.println("Enter the number of elements in the first array :");
        Size1 = sc.nextInt();
        if(Size1<=0)
        {
            System.out.println("Invalid range");
            return;
        }
        int [] a = new int[Size1];
        System.out.println("Enter the elements in the first array");
        for(i=0;i<Size1;i++)
        {
            a[i] = sc.nextInt();
            if(a[i]<=0)
            {
                System.out.println("Invalid range");
                return;
            }
        }
        
        System.out.println("Enter the number of elements in the second array :");
        Size2 = sc.nextInt();
        if(Size2<=0)
        {
            System.out.println("Invalid Range");
            return;
        }
        if(Size1 != Size2)
        {
            System.out.println("Unable to swap size differs");
            return;
        }
        int[] b = new int[Size2];
        System.out.println("Enter the elements in the second array");
        for(i=0;i<Size2;i++)
        {
            b[i] = sc.nextInt();
            if(b[i]<=0)
            {
                System.out.println("Invalid range");
                return;
            }
        }
        
        for(i=0;i<Size1;i++)
        {
            a[i] = a[i] + b[i];
            b[i] = a[i] - b[i];
            a[i] = a[i] - b[i];
        }
        
        System.out.println("The first array after swapping is :");
        printAttay(a,Size1);
        System.out.println("\nThe second array after swapping is :");
        printAttay(b,Size2);
    }
    
    public static void printAttay(int[] arr, int size)
    {
        for(int x : arr)
            System.out.print(x+" ");
    }
}


19. Make a number
Path: JAVA/Arrays/Make a number/EvenNumber.java
import java.util.*;
import java.lang.*;

class EvenNumber{
    public static void main(String[] args){
        
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the size of an array:");
        int size=sc.nextInt();
        
        if(size>0){
            
            int a[] =new int[size];
            ArrayList<Integer> a1 = new ArrayList<Integer>();
            System.out.println("Enter the array elements:");
            for(int i=0;i<size;i++)
            {
                a[i]=sc.nextInt();
                if(a[i]%2==0 && a[i]>=2 && a[i]<=8)
                    a1.add(a[i]);
            }
            if(a1.size()!=0)
            {
                for(int i=0;i<a1.size();i++){
                    System.out.print(a1.get(i));
                }
            }
            else{
                System.out.println("Single digit even number is not found in the array");
            }
        }
        else{
            System.out.println("Invalid array size");
        }
    }
}


20. Marathon Data Analysis
Path: JAVA/Arrays/Marathon Data Analysis (2D Array)/Main.java
import java.util.*;
import java.text.DecimalFormat;

public class Main{
    
       static double[][] arr2D = new double[4][7];
       static String[] names = {"David","Charles","Antony","Leo"};
       static double sum=0,sum1=0,sum2=0,sum3=0;
       static double avg=0,avg1=0,avg2=0,avg3=0,avg4=0,avg5=0,avg6=0;
       
       public static void main(String[] args){
            
            Scanner sc = new Scanner(System.in);
            Main obj = new Main();
            
            for(int i=0;i<4;i++)
            {
                for(int j=0;j<7;j++)
                {
                    arr2D[i][j]=sc.nextDouble();
                }
            }
            
            System.out.println("Total Distance covered by each participant:");
            obj.totalDis();
            obj.avgDis();
            obj.display();
       }
       
       void avgDis()
       {
           int flag1=0,j;
           
           for(int i=0;i<7;i++)
           {
               for(j=0;j<4;j++)
               {
                   if(flag1==0)
                       avg+=arr2D[j][i];
                   if(flag1==1)
                        avg1+=arr2D[j][i];
                    if(flag1==2)
                        avg2+=arr2D[j][i];
                    if(flag1==3)
                        avg3+=arr2D[j][i];
                    if(flag1==4)
                        avg4+=arr2D[j][i];
                    if(flag1==5)
                        avg5+=arr2D[j][i];
                    if(flag1==6)
                        avg6+=arr2D[j][i];
               }
               flag1++;
           }
       }
       
       void totalDis()
       {
           int flag=0,j;
           
           for(int i=0;i<4;i++)
           {
               for(j=0;j<7;j++)
               {
                   if(flag==0)
                        sum=sum+arr2D[i][j];
                    if(flag==1)
                        sum1=sum1+arr2D[i][j];
                    if(flag==2)
                        sum2=sum2+arr2D[i][j];
                    if(flag==3)
                        sum3=sum3+arr2D[i][j];
               }
               flag++;
           }
       }
       
       void display()
       {
           int i=0;
         
           System.out.println(names[i++]+" "+(new DecimalFormat("0.00").format(sum))+" kms");
           System.out.println(names[i++]+" "+(new DecimalFormat("0.00").format(sum1))+" kms");
           System.out.println(names[i++]+" "+(new DecimalFormat("0.00").format(sum2))+" kms");
           System.out.println(names[i]+" "+(new DecimalFormat("0.00").format(sum3))+" kms");
           
           System.out.println("Average distance covered on each day:");
           int j=4;
           i=0;
           while(i!=7)
           {
               System.out.println("Day1:"+(new DecimalFormat("0.00").format(avg/j))+" kms");
               i++;
               System.out.println("Day2:"+(new DecimalFormat("0.00").format(avg1/j))+" kms");
               i++;
               System.out.println("Day3:"+(new DecimalFormat("0.00").format(avg2/j))+" kms");
               i++;
               System.out.println("Day4:"+(new DecimalFormat("0.00").format(avg3/j))+" kms");
               i++;
               System.out.println("Day5:"+(new DecimalFormat("0.00").format(avg4/j))+" kms");
               i++;
               System.out.println("Day6:"+(new DecimalFormat("0.00").format(avg5/j))+" kms");
               i++;
               System.out.println("Day7:"+(new DecimalFormat("0.00").format(avg6/j))+" kms");
               i++;
           }
       }
}


21. Mark Comparison
Path: JAVA/Arrays/Mark Comparison/Mark Comparison/Main.java
import java.util.*;
public class Main {
    public static void main (String[] args){
        Scanner sc=new Scanner(System.in);
        int f=sc.nextInt();
        int flag=0;
        int fa[]=new int[20];
        for(int i=1;i<=f;i++)
        {
            fa[i]=sc.nextInt();
            if(fa[i]<0)
            {
                System.out.println("No Negative Elements");
                System.exit(0);
            }
        }
        int s=sc.nextInt();
        int []sa=new int[20];
        if(f!=s){
            System.out.println("Invalid array size");
        }
        else {
            for(int i=1;i<=s;i++){
                sa[i]=sc.nextInt();
                if(sa[i]<0){
                    System.out.println("No Negative Elements");
                    System.exit(0);
                }
                for(int k=1;k<=f;k++){
                    for(int j=1;j<=s;j++){
                        if(fa[k]==sa[j]){
                            flag=1;
                            System.out.println("("+k+","+j+")");
                        }
                    }
                }
            }
            if(flag==0){
                System.out.println("No matching scores");
            }
        }
    }
}


22. Maximum Difference
Path: JAVA/Arrays/Maximum Difference/Main.java
import java.util.*;

public class Main{
    public static void main (String[] args) {
        
        Scanner sc = new Scanner(System.in);
        int num=sc.nextInt();
        sc.nextLine();
        if(num<=0){
            System.out.println("Invalid");
            return;
        }
        int input[]=new int[num];
        for(int i=0;i<num;i++){
            input[i]=sc.nextInt();
            sc.nextLine();
        }
        for(int i:input)
            if(i<0){
                System.out.println("Invalid");
                return;
            }
            int diff[][]=new int[num][num];
            for(int i=0;i<num;i++){
                for(int j=0;j<num;j++){
                    diff[i][j]=Math.abs(input[i]-input[j]);
                }
            }
            
            int max=Integer.MIN_VALUE;
            for(int i=0;i<num;i++){
                for(int j=0;j<num;j++){
                    if(diff[i][j]>max)
                        max=diff[i][j];
                }
            }
            
            for(int i=0;i<num;i++){
                for(int j=0;j<num;j++){
                    if(diff[i][j]==max){
                        System.out.println("("+(i)+","+(j)+")");
                        return;
                    }
                }
            }
    }
}


23. Maximum repeated number
Path: JAVA/Arrays/Maximum repeated number/Main.java
import java.util.Scanner;

public class Main{
    public static void main (String[] args) {
    
        int max=0,count=0,tmpcount=0,size;
        
        Scanner sc=new Scanner(System.in);
        size=sc.nextInt();
        sc.nextLine();
        if(size<=0){
            System.exit(0);
        }
        int[] a=new int[size];
        for(int i=0;i<size;i++){
            a[i]=sc.nextInt();
            sc.nextLine();
        }
        for(int i=0;i<size;i++){
            for(int j=0;j<size;j++){
                if(a[i]==a[j]){
                    tmpcount++;
                }
            }
            if(tmpcount>=count){
                if(a[i]<max&&tmpcount==count){
                    count=tmpcount;
                }else{
                    max=a[i];
                    count=tmpcount;
                }
            }
            tmpcount=0;
        }
        System.out.println(max);
       
    }
}


24. Next Greatest number
Path: JAVA/Arrays/Next Greatest number/Next Greatest number/Main.java
import java.util.Scanner;
import java.util.Arrays;
public class Main{
    
    static void swap(char ar[], int i, int j){
        char temp = ar[i];
        ar[i] = ar[j];
        ar[j] = temp;
    }
    
    static void findNextGreatest(char ar[], int n){
        int i;
        for(i = n -1; i > 0; i--){
            if(ar[i] > ar[i-1])
                break;
        }
        if(i == 0){
            for(int j = 0; j < ar.length; j++)
                System.out.print(ar[j]);
        }
        else{
            int x = ar[i - 1], min = i;
            for(int k = i + 1; k < n; k++){
                if(ar[k] > x && ar[k] < ar[min])
                    min = k;
            }
            swap(ar, i-1, min);
            Arrays.sort(ar, i, n);
            for(int l = 0; l < ar.length; l++)
                System.out.print(ar[l]);
        }
    }
    
    
    public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);
        String input = sc.next();
        char arr[] = input.toCharArray();
        findNextGreatest(arr, arr.length);
        
    }
}


25. Numerology
Path: JAVA/Arrays/Numerology/Numerology.java
import java.util.*;
public class Numerology 
{
    char[][] num_val={{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H','I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'},
                    {1, 2, 3, 4, 5, 8, 3, 5, 1, 1, 2, 3, 4, 5, 7, 8, 1, 2, 3, 4, 6, 6, 6, 5, 1, 7}};
                    
    public char numerological_value(char chr)
    {
        for(int i=0;i<26;i++)
        {
            if(chr==(num_val[0][i]))
            {
                return num_val[1][i];
            }
        }
        return 0;
    }
    
    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        Numerology obj=new Numerology();
        
        System.out.println("Enter your name:");
        String name=sc.nextLine();
        
        int len=name.length();
        int flag=0, val=0;
        
        for(int i=0; i<len;i++)
        {  
            
            char r=name.charAt(i);
            int temp=(obj.numerological_value(r));
            if(temp==0)
            {
                System.out.println("Invalid name");
                flag++;
                break;
            }
            else
            {
                val+=(int)temp;
            }
        }
        if(flag==0)
        {
            System.out.println("Your numerology no is:"+val);
        }
    }
}


26. Pass and Fail count
Path: JAVA/Arrays/Pass and Fail Count/Pass and Fail Count/Count.java
import java.util.*;
public class Count {
    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        
        System.out.println("Enter the no of subjects:");
        int no_sub=sc.nextInt();
        
        if(no_sub>0 && no_sub<=20)
        {
            int marks[]=new int[no_sub];
            
            for(int i=0;i<no_sub;i++)
            {
                marks[i]=sc.nextInt();
            }

            int pass=0,fail=0;
            for(int i=0;i<no_sub;i++)
            {
                if(marks[i]<50)
                {
                    fail++;
                }
                else
                {
                    pass++;
                }
            }
            
                if(fail==0)
                {
                    System.out.println("Ram passed in all subjects");
                }
                else if(pass==0)
                {
                    System.out.println("Ram failed in all subjects");
                }
                else
                {
                    System.out.println("Ram passed in "+pass+" subjects and failed in "+fail+" subjects");
                }
        }
        else
        {
            System.out.println("Invalid input range");
        }
        
    }
}


27. Retail Shop
Path: JAVA/Arrays/Retail Shop/Shop.java
import java.util.*;
public class Shop 
{   
    private String shopName;
    private String shopAddress;
    private String[] products;
    
    public Shop(String shopName, String shopAddress, String[] products)
    {
        this.shopName=shopName;
        this.shopAddress=shopAddress;
        this.products=products;
    }
    
    public boolean checkProductAvailability(String productname)
    {int len=products.length;
        for(int i=0;i<len;i++)
        {
            if(productname.equalsIgnoreCase(products[i]))
            {
                return true;
            }
        }
        return false;
    }
    
   /* public void setShopName(String shopName)
    {
        this.shopName=shopName;
    }*/
    
    public String getShopName()
    {
        return this.shopName;
    }
    
    /*public void setShopAddress(String shopAddress)
    {
        this.shopAddress=shopAddress;
    }*/
    
    public String getShopAddress()
    {
        return this.shopAddress;
    }
    
    /*public void setProducts(String[] products)
    {
        this.products=products;
    }*/
    
    public String[] getProducts()
    {
        return this.products;
    }

    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        //Shop obj=new Shop();
        
        System.out.println("Enter the shopname:");
        String shop_name=sc.nextLine();
        
        System.out.println("Enter the address:");
        String shop_address=sc.nextLine();
        
        System.out.println("Enter number of products:");
        int no_products=sc.nextInt();
        sc.nextLine();
        String[] products=new String[no_products];
        for(int i=0;i<no_products;i++)
        {
            products[i]=sc.nextLine();
        }
        
        Shop obj=new Shop(shop_name, shop_address, products);
        //obj.setShopName(shop_name);
        //obj.setShopAddress(shop_address);
        //obj.setProducts(products);
        
        System.out.println("Enter the product to be searched:");
        String srch=sc.nextLine();
        
        if(obj.checkProductAvailability(srch))
        {
            System.out.println("Product is available at "+obj.getShopName()+", "+obj.getShopAddress());
        }
        else
        {
            System.out.println("Product is not available at "+obj.getShopName()+", "+obj.getShopAddress());
        }
    }
}


28. Search a Course
Path: JAVA/Arrays/Search a Course/Course.java
import java.util.*;
public class Course
{
    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter no of course:");
        int no_crs=sc.nextInt();
        if(no_crs>0)
                  { 
                    System.out.println("Enter course names:");
                
                    String crs[]=new String[no_crs];
                    
                    for(int i=0;i<no_crs;i++)
                    {
                        crs[i]=sc.next();
                    }
                    
                    System.out.println("Enter the course to be searched:");
                    String srch=sc.next();
                    
                    int flag=0;
                    for(int i=0;i<no_crs;i++)
                    {
                        if(srch.equals(crs[i]))
                        {
                            flag++;
                        }
                    }
                    
                    if(flag!=0)
                    {
                        System.out.println(srch+" course is available");
                    }
                    else
                    {
                        System.out.println(srch+" course is not available");
                    }
                }
                else
                {
                    System.out.println("Invalid Range");
                }
        
        
        
    }
}

29. Sort the first and second half of an array
Path: JAVA/Arrays/Sort the first and second half of an array/ArraySort.java
import java.util.*;
public class ArraySort 
{
    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        
        System.out.println("Enter the size of an array:");
        int n=sc.nextInt();
        
            if(n>0)
            {
                int[] arr=new int[n];
                System.out.println("Enter the elements:");
                for(int i=0;i<n;i++)
                {
                    arr[i]=sc.nextInt();
                }
                
                int[] arr1=Arrays.copyOfRange(arr,      0,   (n+1)/2);
                int[] arr2=Arrays.copyOfRange(arr,  (n+1)/2,    n   );
                
                Arrays.sort(arr1);
                //Arrays.sort(arr2, Collections.reverseOrder());
                
                for(int i=0;i<n/2;i++)
                {
                    for(int j=0;j<(n/2)-1;j++)
                    {
                        if(arr2[j]<arr2[j+1])
                        {
                            int temp=arr2[j];
                            arr2[j]=arr2[j+1];
                            arr2[j+1]=temp;
                        }
                    }
                }
                
                int len2=arr1.length+arr2.length;
                int[] res=new int[len2];
                
                System.arraycopy(arr1, 0, res,      0,  (n+1)/2 );
                System.arraycopy(arr2, 0, res, (n+1)/2,     n/2   );
                
                for(int i : res)
                {
                    System.out.println(i);
                }
            }
            else
            {
                System.out.println("Array size should be greater than 0");
            }
    }
}


30. Sort the values in descending order
Path: JAVA/Arrays/Sort the values in descending order/Main.java
import java.util.Scanner;
public class Main
{
    public static void main(String[] args) 
    {
        int n, temp;
        Scanner s = new Scanner(System.in);
        System.out.print("Enter the array size \n");
        n = s.nextInt();
        int a[] = new int[n];
        System.out.println("Enter the values");
        for (int i = 0; i < n; i++) 
        {
            a[i] = s.nextInt();
        }
        for (int i = 0; i < n; i++) 
        {
            for (int j = i + 1; j < n; j++) 
            {
                if (a[i] < a[j]) 
                {
                    temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
        for (int i = 0; i < n - 1; i++) 
        {
            System.out.print(a[i] + "\n");
        }
        System.out.print(a[n - 1]);
    }
}


31. Sort the values
Path: JAVA/Arrays/Sort the values/Main.java
import java.util.Scanner;
public class Main
{
    public static void main(String[] args) 
    {
        int n, temp;
        Scanner s = new Scanner(System.in);
        System.out.print("Enter the array size \n");
        n = s.nextInt();
        int a[] = new int[n];
        System.out.println("Enter the values");
        for (int i = 0; i < n; i++) 
        {
            a[i] = s.nextInt();
        }
        for (int i = 0; i < n; i++) 
        {
            for (int j = i + 1; j < n; j++) 
            {
                if (a[i] > a[j]) 
                {
                    temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
        for (int i = 0; i < n - 1; i++) 
        {
            System.out.print(a[i]);
            System.out.println("\n");
        }
        System.out.print(a[n - 1]);
    }
}


32. Sum of factorial of positive and single digit numbers in an array
Path: JAVA/Arrays/Sum of factorial of positive and single digit numbers in an array/Factorial.java
import java.util.*;
public class Factorial{
    public static void main (String[] args) {
        
        int size;
        System.out.println("Enter the size of an array:");
        Scanner sc=new Scanner(System.in);
        size=sc.nextInt();
        if(size<=0){
            System.out.println("Invalid array size");
            return ;
        }
        System.out.println("Enter the elements:");
        int array[]=new int[size];
        for(int i=0;i<size;i++)
        array[i]=sc.nextInt();
        boolean isValid=false;
        for(int i=0;i<size;i++){
            if(array[i]>0&&array[i]<10){
                int sum=1;
                isValid=true;
                while(array[i]>0){
                    sum=sum*array[i];
                    array[i]=array[i]-1;
                }
                array[i]=sum;
            }else
            array[i]=0;
        }
        int sum=0;
        for(int i:array)
        sum+=i;
        if(isValid)
        System.out.println(sum);
        else
        System.out.println("No positive and single digit numbers found in an array");
    }
}


33. Sum of the corresponding elements in 2 arrays
Path: JAVA/Arrays/Sum of the corresponding elements in 2 arrays/ArrayAccumulator.java
import java.util.*;

class ArrayAccumulator{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the size of first array:");
        int n=sc.nextInt();
        if(n<=0){
            System.out.println("Invalid array size");
        }
        else{
            int[] a=new int[n];
            System.out.println("Enter elements for first array:");
            for(int i=0;i<n;i++){
                a[i]=sc.nextInt();
            }
            System.out.println("Enter the size of second array:");
            int n1=sc.nextInt();
            if(n1<=0){
                System.out.println("Invalid array size");
            }
            else{
                int[] a1=new int[n1];
                System.out.println("Enter elements for second array:");
                for(int i=0;i<n1;i++){
                    a1[i]=sc.nextInt();
                }
                int a2;
                if(n==n1){
                    for(int i=0;i<n;i++)
                        System.out.println(a[i]+a1[i]);
                }
                else if(n>n1){
                    for(int i=0;i<n1;i++)
                        System.out.println(a[i]+a1[i]);
                    for(int i=n1;i<n;i++)
                        System.out.println(a[i]);
                }
                else if(n<n1){
                    for(int i=0;i<n;i++)
                        System.out.println(a[i]+a1[i]);
                    for(int i=n;i<n1;i++)
                        System.out.println(a1[i]);
                }
            }
        }
    }
}


34. Sum of the maximum and the minimum element
Path: JAVA/Arrays/Sum of the maximum and the minimum element/Sum.java
import java.util.*;
public class Sum 
{
    int max(int[] arr)
    {
        int max=0;
        for(int i=0;i<arr.length;i++)
        {
            if(arr[i]>max)
            {
                max=arr[i];
            }
        }
        return max;
    }
    
    int min(int[] arr)
    {
        int min=arr[0];
        for(int i=0;i<arr.length;i++)
        {
            if(arr[i]<min)
            {
                min=arr[i];
            }
        }
        return min;
    }
    
    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        Sum obj=new Sum();
        
        System.out.println("Enter the size of an array:");
        int n=sc.nextInt();
        
        if(n>0)
        {
            int[] arr=new int[n];
            
            System.out.println("Enter the elements:");
            for(int i=0;i<n;i++)
            {
                arr[i]=sc.nextInt();
            }
            
            System.out.println(obj.max(arr)+obj.min(arr));
        }
        else
        {
            System.out.println("Invalid Array Size");
        }    
        
    }
}


35. Zig zag Array
Path: JAVA/Arrays/Zig zag Array/Zig zag Array/Main.java
import java.util.*;
public class Main 
{
    void zigzag(int[] arr)
    {
        boolean flag=true;
        int temp=0;
        
        for(int i=0;i<(arr.length-1);i++)
        {
            if(flag)
            {
                if(arr[i]>arr[i+1])
                {
                 temp = arr[i];
                 arr[i]=arr[i+1];
                 arr[i+1]=temp;
                }
            }
            else
            {
                if(arr[i]<arr[i+1])
                {
                    temp=arr[i];
                    arr[i]=arr[i+1];
                    arr[i+1]=temp;
                }
            }
            flag= !flag;
        }
        
        for(int i=0;i<arr.length;i++)
        {
            System.out.println(arr[i]);
        }
    }
    public static void main (String[] args) 
    {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        
        int arr[]=new int[n];
        int len=arr.length;
        
        for(int i=0;i<len;i++)
        {
            arr[i]=sc.nextInt();
        }
        
        Main obj=new Main();
        obj.zigzag(arr);
    }
}


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