Best factorial calculator in C++

/*

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*/










#include <iostream>
#include <math.h>
#include <corecrt_math_defines.h>
using namespace std;

int f = 1;

int x,y;

int main()
{
    cout << "Enter your number to get \"!\" : ";
    cin >> x;
    y = x;

    while (x != 0) {
        f *= x--;
    }

    cout << "Factorial of " << y << " is = " << f << endl;

    return 0;
}