Swapping Diagonal elements of a Matrix

Java Program To Swap Diagonal elements of a Matrix

A matrix of order N X N is given. Swap the elements of major and minor diagonals. 

Major Diagonal Elements of a Matrix are the ones that occur from Top Left of Matrix Down To Bottom Right Corner. The Major Diagonal is also known as Main Diagonal or Primary Diagonal.

Minor Diagonal Elements of a Matrix : The Minor Diagonal Elements are the ones that occur from Top Right of Matrix Down To Bottom Left Corner. Also known as Secondary Diagonal.

Logic and Program :-

Logic :-

Program :-

import java.io.*;
import java.util.*;
class Matrix
{
    public static void main(String args[])
    {
        int n,a; // here a is the temporary variable for swapping the elements
        int i,j; // variable for loop
        Scanner in= new Scanner(System.in);
        System.out.println("Enter Array Capacity");
        n= in.nextInt(); // To Input Array Capacity
        int ar[][]=new int[n][n]; // Array Defined
        System.out.println("Enter Array Elements");
        for(i=0;i<n;i++)
        {
            for(j=0;j<n;j++)
            {
                ar[i][j]= in.nextInt(); // Input Array Elements
            }
        }
        System.out.println("Original Matrix"); // Display Original Matrix
        for(i=0;i<n;i++)
        {
            for(j=0;j<n;j++)
            {
                System.out.print(ar[i][j]);
            }
            System.out.println();
        }
        int k = n-1; // Variable value used to swap value
        for(i=0;i<n;i++) // Value is Swapping in this Loop
        {
            a = ar[i][i];
            ar[i][i]=ar[i][k-i];
            ar[i][k-i]=a;
        }
        System.out.println("New Matrix"); // Printing New Matrix After Swapping Diagonal
        for(i=0;i<n;i++)
        {
            for(j=0;j<n;j++)
            {
                System.out.print(ar[i][j]);
            }
            System.out.println();
        }
    } // End of main method
} // End of class



All the best :-)