C Exercises: Find the sum of lower triangular elements of a matrix

C Array: Exercise-75 with Solution

Write a program in C to find the sum of the lower triangular elements of a matrix.

Visual Presentation:

Sample Solution:

C Code:

#include <stdio.h>

int main() {
    int R, C, n, r, c, sum = 0;
    int arr1[3][3] = {{1, 2, 3},
                      {4, 5, 6},
                      {7, 8, 9}};
    R = C = n = 3;
    int i, j;

    // Print original array
    printf("The given array is :  \n");
    for (i = 0; i < R; i++) {
        for (j = 0; j < C; j++) {
            printf("%d  ", arr1[i][j]);
        }
        printf("\n");
    }

    printf("The elements being summed of the lower triangular matrix are: ");
    for (r = 0; r < R; r++) {
        for (c = 0; c < C; c++) {
            if (r > c) {
                printf("%d  ", arr1[r][c]); // Print the elements of the lower triangular matrix
                sum += arr1[r][c]; // Add the elements of the lower triangular matrix
            }
        }
    }
    printf("\nThe Sum of the lower triangular Matrix Elements are: %d", sum);
    return 0;
}

Sample Output:

The given array is :  
1  2  3  
4  5  6  
7  8  9  
The elements being summed of the lower triangular matrix are: 4  7  8  
The Sum of the lower triangular Matrix Elements are: 19

Flowchart:

C Programming Code Editor:

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