指针---内存

#include<stdio.h>
#include"common.h"
int main()
{
    int a=10,b=20;
    int *p2,*p3;
    char *p1=(char*)malloc(8);
    p2=(int*)p1;
    *p2=b;

    printf("%d\n",*p1);  //*p1随*p2改变
}