C++ Factorial of Number Examples

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#include <iostream>
using namespace std;
int fact (int i) {
    int result = 1;
    while (i > 0) {
        result = result * i;
        i = i-1;
    }
    return(result);
}

int main () {
    int n;
    cout << "Enter a natural number: ";
    cin >> n;
    while (n <0) {
        cout << "Please re-enter: ";
        cin >> n;
    }
    cout << n << "! = " << fact(n) << endl;
    return(0);
}

Output

Enter a natural number: 0! = 1

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