#include <iostream>
using namespace std;
int main()
{
        const int i = 10;
        int * p =(int *) &i;
        *p = 20;
        cout<<"*p address:"<<p<<endl;
        cout<<"i address:"<<&i<<endl;
        cout<<"i :"<<i<<endl;
        cout<<"*p:"<<*p<<endl;
        return 0;
}
运行结果：
*p address:0xbff4b968
i address:0xbff4b968
i :10
*p:20
上述代码用G++编译
#include <stdio.h>
int main( void )
{
const int a = 10;
int *p = (int*)(&a);

*p = 100;

printf("a address: %#p", &a );
printf("*p address: %#p", p );
printf("a value: %d", a );
printf("*p value: %d", *p);
return 0;
}
用gcc编译
结果为：
a address: 0x0022ff74
*p address:0x0022ff74
a value: 100
*p value: 100
为什么会有这种结果呢？？先大家谈论  我晚上在发答案~~~~