# 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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