/*为什么我一输入的n超过20就会变得很奇怪*//*下面是代码*//*再下面是图片*/#include<stdio.h>int sum(int n){ long long unsigned int b; if(n==1||n==0) {b=1;} else {b=n*sum(n-1);} return b;}main(){ int n; while(1) { printf("\n请输入N的值:"); scanf("%d",&n); printf("\nN!=%d\n",sum(n)); }}/*这是用递归方式求N!*/