C语言学习(16)

//利用递归求!n
#include<stdio.h>
double fact(int n){
    double s;
    if(n==0 || n==1){
        s=1;
    }else{
        s=n*fact(n-1);
    }
    return s;
}

int main(){
    int num;
    printf("请输入一个数字:\n");
    scanf("%d",&num);
    printf("!%d=%10.01f\n",num,fact(num));
    return 0;
}