关于指针的例子

 1 #include "stdio.h"
 2 void swap(int *p1,int *p2);
 3 int main(void)
 4 {
 5     int x= 0,y = 200;
 6     printf("X  = %d,Y = %d\n",x,y);
 7     printf("X p = %p,Y p= %p\n",&x,&y);
 8     printf("please waiting for swaping \n");
 9     swap(&x,&y);
10     printf("swaping end \n");
11     printf("X  = %d,Y = %d\n",x,y);
12     printf("X p = %p,Y p= %p\n",&x,&y);
13     return 1;
14 }
15 void swap(int *p,int *q)
16 {
17     int t = *p;
18     *p = *q;
19     *q = t;
20 }
21