n阶乘的递归算法

#include<stdio.h>
double fact(int n);
int main(){
int n;
scanf("%d",&n);
printf("%f",fact(n));
return 0;
}

double fact(int n){
double result;
if(n==1||n==0) result=1;
else result=n*fact(n-1);
return result;
}