Question

program to find sum of diagonal elements of matrix

Matrix  = [9, 8, 7]
          [6, 5, 4]
          [3, 2, 1]

SUM OF DIAGONAL MATRIX:25

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Code

import java.util.Scanner;
public class SumOfDiagonalsOfMatrix
{
    public static void main(String[] args)
    {
        int size=0,i=0,j=0,sum=0;
        int a[][];


        Scanner sc=new Scanner(System.in);
        System.out.println("ENTER THE SIZE OF MATRIX");
        size=sc.nextInt();

        a=new int[size][size];
        System.out.println("ENTER THE ELEMENTS IN MATRIX");
        for(i=0;i< size;i++)
        {
            for(j=0;j< size;j++)
            {
                a[i][j]=sc.nextInt();
            }
        }



        for(i=0;i< size;i++)
        {
            for(j=0;j< size;j++)
            {

                if(i==j || (i+j==size-1))
                {
                    sum=sum+a[i][j];

                }


            }

        }
        System.out.println("SUM OF DIAGONALS OF MATRIX:"+sum);

    }
}