WP2908392647的博客

#include<stdio.h> long fac(int n); int main() { int n; printf("please input a number \n"); scanf("%d",&n); if(n<0) { printf("Date error,please input again\n"); } else { printf("%d!=%d\n",n,fac(n)); } return 0; } long fac(int n) .

#include<stdio.h> int swap(int x,int y); int main() { int a,b; scanf("%d%d",&a,&b); swap(a,b); printf("a=%d,b=%d\n",a,b); return 0; } int swap(int x,int y) { int t; t=x; x=y; y=t; printf("交换后的x=%d,y=%d\n",x,y); }