Question 4.4: Write a program in Java to find sum of right diagonals of a matrix.
Test Data :
Input the size of the square matrix : 2
Input elements in the first matrix :
element - [0],[0] : 1
element - [0],[1] : 2
element - [1],[0] : 3
element - [1],[1] : 4
Expected Output :
The matrix is :
1 2
3 4
Addition of the right Diagonal elements is :5
Solution:
package lab4problem4;
import java.util.Scanner;
public class Lab4Problem4 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Input the size of the square matrix : ");
int size = input.nextInt();
System.out.println("Input elements in the first matrix :");
int matrix[][] = new int[size][size];
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
System.out.print("element - [" + i + "],[" + j + "] : ");
matrix[i][j] = input.nextInt();
}
}
System.out.println("The matrix is : ");
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
System.out.print(matrix[i][j] + " ");
}
System.out.println();
}
int diagonal = 0;
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
if(i==j) {
diagonal = diagonal + (matrix[i][j]);
}
}
}
System.out.print("Addition of the right Diagonal elements is : " + diagonal);
}
}
