C++ Program to Find Factorial

#include <iostream>
using namespace std;
int main() {
    int n;
    long double factorial = 1.0;
    cout << "Enter a positive integer: ";
    cin >> n;
    if (n < 0)
        cout << "Error! Factorial of a negative number doesn't exist.";
    else {
        for(int i = 1; i <= n; ++i) {
            factorial *= i;
        }
        cout << "Factorial of " << n << " = " << factorial;
    }
    return 0;
}

OUTPUT:

Enter a positive integer: 12
Factorial of 12 = 479001600

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