Question

Write a C++ function that takes a two-dimensional array and a row index. The function should return the multiplication of all the values in the row. Write a main () program to test the function.

Student Note: Please solve the question as simple as you can.

Answer 1

#include <iostream>

using namespace std;

// change dimensions of matrix as you like here
#define NUM_ROWS 3
#define NUM_COLS 3

int multiply_rows(int matrix[][NUM_COLS], int row) {
    int result = 1;
    for (int i = 0; i < NUM_COLS; ++i) {
        result *= matrix[row][i];
    }
    return result;
}

int main() {
    int matrix[NUM_ROWS][NUM_COLS];
    cout << "Enter matrix of " << NUM_ROWS << " rows and " << NUM_COLS << " columns" << endl;
    for (int i = 0; i < NUM_ROWS; ++i) {
        for (int j = 0; j < NUM_COLS; ++j) {
            cin >> matrix[i][j];
        }
    }

    int index;
    cout << "Enter a valid row value from 0 to " << NUM_ROWS - 1 << ": ";
    cin >> index;

    cout << "Product of all numbers in row " << index << " is " << multiply_rows(matrix, index) << endl;
    return 0;
}