Example: Add Two 3x3 Matrices in C++

// Add Two 3x3 Matrices
#include <iostream>
using namespace std;

int main() {
    // Step 1: Declare three 3x3 integer matrices
    int matrixA[3][3] = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };

    int matrixB[3][3] = {
        {9, 8, 7},
        {6, 5, 4},
        {3, 2, 1}
    };

    int sumMatrix[3][3]; // To store the result of addition

    // Step 2: Print the first matrix
    cout << "Matrix A:" << endl;
    for (int i = 0; i < 3; ++i) {
        for (int j = 0; j < 3; ++j) {
            cout << matrixA[i][j] << " ";
        }
        cout << endl;
    }
    cout << endl;

    // Step 3: Print the second matrix
    cout << "Matrix B:" << endl;
    for (int i = 0; i < 3; ++i) {
        for (int j = 0; j < 3; ++j) {
            cout << matrixB[i][j] << " ";
        }
        cout << endl;
    }
    cout << endl;

    // Step 4: Perform matrix addition
    // Iterate over rows
    for (int i = 0; i < 3; ++i) {
        // Iterate over columns
        for (int j = 0; j < 3; ++j) {
            sumMatrix[i][j] = matrixA[i][j] + matrixB[i][j];
        }
    }

    // Step 5: Print the sum matrix
    cout << "Sum of Matrix A and Matrix B:" << endl;
    for (int i = 0; i < 3; ++i) {
        for (int j = 0; j < 3; ++j) {
            cout << sumMatrix[i][j] << " ";
        }
        cout << endl;
    }

    return 0;
}