#include<stdio.h>
double Fact(unsigned int n);
int main()
{
    int m;
    for (m=1; m<=40; m++)
    {
        printf("%d! = %.0f\n", m, Fact(m));
    }
    return 0;
}
double Fact(unsigned int  n)
{
    unsigned int   i;
    double result = 1;
    for (i=2; i<=n; i++)
        result *= i;
    return result;   
}