#include"stdio.h"void main(){int a,b,sum;a=;b=;sum=a+b;printf("sum is %d\n",sum);}
main() { int a,b, *p=&a,*q=&b; a=10; b=20; *p=b; //*p=b=20,也就是a=20 *q=a; //*q=a=20,也就是b=20 printf("%d,%d\n",a,b); }