一直以为string = char[]，看来在某些情况下会出意外？
还是我的理解本来就片面？

#include <iostream>
//typedef和#define
typedef int prablint;
#define prablchar char

typedef int* prabl_int_p;
#define prabl_char_p char*


int main()
{
using namespace std;
prablint a = 0;
prablchar b = 'a';

prabl_int_p c,d;
prabl_char_p e,f;

cout << sizeof(a) << endl;
cout << sizeof(int) << endl;
cout << sizeof(b) << endl;
cout << sizeof(char) << endl;
cout << sizeof(c) << "," << sizeof(int*) << endl;
cout << sizeof(d) << "," << sizeof(int*) << endl;

cout << sizeof(e) << "," << sizeof(char*) << endl;
cout << sizeof(f) << "," << sizeof(char*) << endl; //f是char型，不是char*。所以用typedef是更安全的

system("PAUSE");
return 0;
}