factorial function help :)

[CpluspProgrammer]

Hey all, I'm trying to write a factorial function in c++, but I seem to be having some problems. When i pass in the value 5 to my factorial function, i get the result: 2686740 LOL, i'm not sure what's wrong. Any tips to solving this is much appreciated! Thanks.
Nevermind guys! lolol i forgot to return x from the function......

  #include <iostream>
#include <iomanip>

using namespace std;

int factorial(int x) {
     for(int i = x; i > 1; i--)
     {
         x = x * (i - 1);
     }
}
int main() 
{
    int number;
    number = factorial(5);
    cout << number << endl;
    system("pause");
    return 0;
}