C Programming to find factorial of a number

/*to find factorial*/
#include<stdio.h>
#include<stdlib.h>
int main( )
{
    int i,n,fact=1;
    printf ("enter number: ");
    scanf ("%d",&n);
    if (n<0)
        printf ("factorial doesnot exist");
    else if (n==0)
        printf ("factorial of 0 is 1");
    else
    {
        for (i=n; i>=1; i--)
            fact*=i;
        printf ("factorial of %d is %d",n,fact);
    }
    system ("pause");
    return 0;
}