Example: Calculate Row and Column Sums of a Matrix in C

// Calculate Row and Column Sums of a Matrix
#include <stdio.h>

#define ROWS 3
#define COLS 3

int main() {
    // Step 1: Initialize the matrix
    int matrix[ROWS][COLS] = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };
    int i, j; // Loop counters
    int rowSum;
    int colSum;

    printf("Matrix:\n");
    for (i = 0; i < ROWS; i++) {
        for (j = 0; j < COLS; j++) {
            printf("%d ", matrix[i][j]);
        }
        printf("\n");
    }
    printf("\n");

    // Step 2: Calculate and print row sums
    for (i = 0; i < ROWS; i++) {
        rowSum = 0; // Reset sum for each new row
        for (j = 0; j < COLS; j++) {
            rowSum += matrix[i][j]; // Add current element to row sum
        }
        printf("Sum of Row %d: %d\n", i + 1, rowSum);
    }
    printf("\n");

    // Step 3: Calculate and print column sums
    for (j = 0; j < COLS; j++) { // Outer loop iterates through columns
        colSum = 0; // Reset sum for each new column
        for (i = 0; i < ROWS; i++) { // Inner loop iterates through rows
            colSum += matrix[i][j]; // Add current element to column sum
        }
        printf("Sum of Column %d: %d\n", j + 1, colSum);
    }

    return 0;
}