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• #include <stdio.h>
• void  change(int *p){
•     *p = 100;
•     printf("p's addr is %p,p is %p,*p is %d\n",&p,p,*p);
•     return;
• }
• int main(){
•     int a = 10;
•     printf("before a is %d\n",a);
•     int *p = &a;
•     printf("*p  is %p,&a = %p,*p = %d\n",p,&a,*p);
•     change(p);
•     printf("after a is %d,p = %p,*p is %d\n",a,p,*p);
•     return 0;
• }