Sum of Boundary Diagonals
This program calculates sum of both diagonals of a matrix.
Problem Statement
Write a Java program to calculate sum of both diagonals of a 4x4 matrix.
Source Code
| 1 | public class MatrixBoundaryDiagonalSum { |
| 2 | public static void main(String[] args) { |
| 3 | System.out.println("Eduinq Matrix Boundary Diagonal Sum"); |
| 4 | int[][] A = { |
| 5 | {1,2,3,4}, |
| 6 | {5,6,7,8}, |
| 7 | {9,10,11,12}, |
| 8 | {13,14,15,16} |
| 9 | }; |
| 10 | int sum=0; |
| 11 | for(int i=0;i<4;i++){ |
| 12 | sum+=A[i][i]; |
| 13 | sum+=A[i][4-1-i]; |
| 14 | } |
| 15 | System.out.println("Sum of both diagonals = "+sum); |
| 16 | } |
| 17 | } |
Program Output
Eduinq Matrix Boundary Diagonal Sum Sum of both diagonals = 68
Explanation
Main diagonal elements are accessed as A[i][i] and secondary diagonal elements as A[i][n-1-i], and a single loop adds both into sum, together calculating the combined boundary diagonal sum.