Factorial using pointer

#include <stdio.h>
#include <stdlib.h>
int fact(int *x, int *y)
{
    int i;
    *y=1;
    if(*x==0)
        return 1;
    for(i=1;i<=*x;i++)
        *y = (*y)*i;
    return *y;
}

int main()
{
    int n,factorial;
    scanf("%d",&n);
    printf("%d\n",fact(&n,&factorial));

    return 0;
}