﻿ C Program: Find the sum of left diagonals of a matrix - w3resource

# C Exercises: Find the sum of left diagonals of a matrix

## C Array: Exercise-24 with Solution

Write a program in C to find the sum of the left diagonals of a matrix.

Visual Presentation:

Sample Solution:

C Code:

``````#include <stdio.h>

int main() {
// Declare variables and matrix
int i, j, arr1[50][50], sum = 0, n, m = 0;

// Display the purpose of the program
printf("\n\nFind sum of left diagonals of a matrix :\n");
printf("---------------------------------------\n");

// Input the size of the square matrix
printf("Input the size of the square matrix : ");
scanf("%d", &n);

m = n; // Storing the size of matrix for left diagonal traversal

// Input elements into the matrix
printf("Input elements in the matrix :\n");
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("element - [%d],[%d] : ", i, j);
scanf("%d", &arr1[i][j]);
}
}

// Display the matrix
printf("The matrix is :\n");
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("% 4d", arr1[i][j]);
}
printf("\n");
}

// Calculate the sum of left diagonals
for (i = 0; i < n; i++) {
m = m - 1; // Decrementing to access elements on the left diagonal
for (j = 0; j < n; j++) {
if (j == m) {
sum = sum + arr1[i][j]; // Adding elements on the left diagonal
}
}
}

// Display the sum of left diagonal elements
printf("Addition of the left Diagonal elements is : %d\n", sum);

return 0;
}
```
```

Sample Output:

```Find sum of left diagonals of a matrix :
---------------------------------------
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
The matrix is :
1   2
3   4
Addition of the  left Diagonal elements is :5
```

Flowchart:

C Programming Code Editor:

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