Faktorial dengan Recursive C++

Code C++
#include <iostream>
#include <iomanip>
using namespace std;
unsigned long factorial ( unsigned long );
int main()
{
    for ( int i = 0; i <= 10; i++)
        cout << setw(2) << i << " !=  " << factorial( i ) << endl;
    return 0;
}
unsigned long factorial(unsigned long number)
{
    if(number <= 1)
        return 1;
    else
        return number * factorial( number - 1);
}

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