C 语言迭代求阶乘问题

#include<stdio.h>
int main(void){
int n, i;
long result = 1;
printf("Input a n:");
scanf("%d",&n);
for (i=1;i<=n;i++)
{
result *= i;
}
if (n > 0)
{
printf("%d! = %ld",n,result);
}
return 0;
}