C Program to Compute the Sum of Diagonals of a Matrix - Source Code, Output & Execution Flow

C Program to Compute the Sum of Diagonals of a Matrix

This tutorial explains c program to compute the sum of diagonals of a matrix with C source code, sample output, and step-by-step execution flow.

#include <stdio.h>
int main() {
    int a[3][3] = {{1,2,3},{4,5,6},{7,8,9}};
    int i, mainSum = 0, secondarySum = 0;
    for (i = 0; i < 3; i++) {
        mainSum += a[i][i];
        secondarySum += a[i][2 - i];
    }
    printf("Main diagonal = %d
Secondary diagonal = %d
", mainSum, secondarySum);
    return 0;
}

Main diagonal = 15
Secondary diagonal = 15

Practice This Program

In this program, the input is read first when required, the core logic is applied step by step, and the final result is displayed using printf(). Follow the execution flow beside the code to understand how each statement contributes to the output.