Sum of Elements of Lower Triangular Matrix

Sum of Elements of Lower Triangular Matrix:


Program:

import java.util.Scanner;

public class LowerTriangularElementsSum {

public static void main(String[] args) {

int r, c;

Scanner s = new Scanner(System.in);

r = s.nextInt();

c = s.nextInt();

if(r!=c) {

System.exit(0);

}

int[][] matrix = new int[r][c];

for(int i = 0; i<r; i++) {

for(int j = 0; j<c;j++) {

matrix[i][j] = s.nextInt();

}

}

int sum = 0;

for(int i = 0; i<r; i++) {

for(int j = 0;j<c; j++) {

if(i>=j) {

System.out.print(matrix[i][j]);

System.out.print(" ");

sum+=matrix[i][j];

}

}

}

System.out.println("\nThe sum of Lower triangular elements of a matrix is: " + sum);

}

}


/* In other words, a square matrix is lower triangular if all its entries above the main diagonal are zero.

 * Example of a 3 × 3 lower triangular matrix: Diagonal matrices are both upper

 *and lower triangular since they have zeroes above and below the main diagonal

 */


Output:

3 3

1 2 3 4 5 6 7 8 9

1 4 5 7 8 9 

The sum of Lower triangular elements of a matrix is: 34


                                                     Happy Coding 💻:-) 

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