# include "stdafx.h" # include <stdio.h> int f(int n) { if(n==1||n==2) return n; else return n*f(n-1); } int main(int argc, char** argv) { int n,sum; scanf("%d",&n); sum=f(n); printf("%d\n",sum); return 0; }
原文：https://www.cnblogs.com/P201821440046/p/10820085.html