Example: Matrix Row and Column Sums Calculation in C++

// Matrix Row and Column Sums Calculation
#include <iostream>
#include <vector> // Required for using std::vector

int main() {
    // Step 1: Define matrix dimensions
    const int M = 3; // Number of rows
    const int N = 3; // Number of columns

    // Step 2: Initialize the matrix (using a 2D vector for flexibility)
    std::vector<std::vector<int>> matrix = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };

    // Step 3: Initialize vectors to store row and column sums
    // 'rowSums' will have M elements, initialized to 0
    std::vector<int> rowSums(M, 0); 
    // 'colSums' will have N elements, initialized to 0
    std::vector<int> colSums(N, 0); 

    // Step 4: Calculate row and column sums by iterating through the matrix
    for (int i = 0; i < M; ++i) { // Outer loop iterates through each row
        for (int j = 0; j < N; ++j) { // Inner loop iterates through each column in the current row
            rowSums[i] += matrix[i][j]; // Add current element to the sum of its row
            colSums[j] += matrix[i][j]; // Add current element to the sum of its column
        }
    }

    // Step 5: Display row sums
    std::cout << "Row Sums:" << std::endl;
    for (int i = 0; i < M; ++i) {
        std::cout << "Row " << i << ": " << rowSums[i] << std::endl;
    }

    // Step 6: Display column sums
    std::cout << "\nColumn Sums:" << std::endl;
    for (int j = 0; j < N; ++j) {
        std::cout << "Column " << j << ": " << colSums[j] << std::endl;
    }

    return 0;
}