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#include <iostream>
using namespace std;

int main()
{
    unsigned int n;
    unsigned long long factorial = 1;

    cout << "Enter an integer: ";
    cin >> n;

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

    cout << n << " factorial is: " << " = " << factorial;
    return 0;
}

Enter an integer: 12
12 factorial is: = 479001600