Sum of Diagonal Elements in a Matrix in Java

 A simple program to show how to solve the sum of diagonal elements in a matrix using Java programming language.

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Program Listing

import java.util.*;

class matrix
{  
	public static void main(String args[])
	{
		Scanner sc = new Scanner(System.in);
		
	        int i,j,row,col,sum=0;
		System.out.println("Enter the number of rows:");
		row = sc.nextInt();
		System.out.println("Enter the number of columns:");
		col = sc.nextInt();

		int[][] mat = new int[row][col];
 
    		System.out.println("Enter the elements of the matrix") ;
    		for(i=0;i<row;i++)
    		{ 
	    		for(j=0;j<col;j++)
	    		{ 
	        		mat[i][j] = sc.nextInt();
    			}
		}
		
    		System.out.println("The elements of the matrix") ;
    		for(i=0;i<row;i++)
    		{ 
	    		for(j=0;j<col;j++)
	    		{ 
	       	 		System.out.print(mat[i][j]+"\t");
    			}
      	 		System.out.println("");
		}

    		for(i=0;i<row;i++)
    		{ 
	    		for(j=0;j<col;j++)
	    		{ 
				if(i+j==2)	//this condition checks for diagonal
				{
					sum = sum + mat[i][j];
				}
    			}
		}

    		System.out.printf("SUM of DIAGONAL elements of the matrix = "+sum) ;
 	}	
}