#include<iostream>
//#include<afx.h>
using namespace std;
struct MyStruct
{
    MyStruct* pself;
     union {
        char str[16];
        char* pstring;
    }u;
    int nSize;
    int nMaxSize;
};
int main()
{
    string str = "string str allenboy\n";
    //CString cstr = "CString cstr allenboy\n";
    printf("%s ", str.c_str());
    MyStruct* ststr =(MyStruct*) &str;
    ststr->u.pstring = "hahaha";
    ststr->nSize = 6;
    printf("%s", str.c_str());
    cin.get();
}