Question

C++

//Write prototype for function factorial that accepts an int num and returns an int

/*

WITH LOOP OF YOUR CHOICE:

Write code for function factorial that accepts an int num

and returns the num's factorial

factorial(5);

1*2*3*4*5

returns 120

DON'T FORGET TO WRITE TEST CASE.

*/

//write includes statements

//write using statements for cin and cout

/*

Use a do while loop to prompt the user for

a number, call the factorial function, and display the number's

factorial. Also, loop continues as long as user wants to.

*/

Answer 1

#include <iostream>

using namespace std;

int factorial(int n);

int main() {
    int n;
    do {
        cout << "Enter a number(negative to stop): ";
        cin >> n;
        if (n >= 0) {
            cout << "Factorial of " << n << " is " << factorial(n) << endl;
        }
    } while (n >= 0);
    return 0;
}

int factorial(int n) {
    int result = 1;
    for (int i = 1; i <= n; ++i) {
        result *= i;
    }
    return result;
}