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Computer Science

Write a program in Java to create a 4 x 4 matrix. Now, swap the elements of 0th row with 3rd row correspondingly. Display the result after swapping.

Sample Input

55332614
81863110
58641712
22142325

Sample Output

22142325
81863110
58641712
55332614

Java

Java Arrays

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Answer

import java.util.Scanner;

public class KboatDDARowSwap
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        int arr[][] = new int[4][4];
        
        System.out.println("Enter elements of 4x4 array ");
        for (int i = 0; i < 4; i++) {
            System.out.println("Enter Row "+ (i+1) + " :");
            for (int j = 0; j < 4; j++) {
                arr[i][j] = in.nextInt();
            }
        }
        
        System.out.println("Input Array:");
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                System.out.print(arr[i][j] + "\t");
            }
            System.out.println();
        }
        
        //Swap 0th and 3rd rows
        for (int j = 0; j < 4; j++) {
            int t = arr[0][j];
            arr[0][j] = arr[3][j];
            arr[3][j] = t;
        }
        
        System.out.println("Swapped Array:");
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                System.out.print(arr[i][j] + "\t");
            }
            System.out.println();
        }
    }
}

Output

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