void out2() const{

include "stdafx.h"

include

using namespace std;

class aa{

int num;

public:

aa(){

int b =10;

num = b;

};

void out1(){

cout<<num<<endl;

}

void out2() const{

cout<<num<<endl;

}

void out3() const{

num+=10; //出错，const函数不能修改其数据成员

cout<<num<<endl;

}

};

int _tmain(int argc, _TCHAR* argv[])

{

aa a1;

a1.out1();

a1.out2();

a1.out3();

const aa a2;

a2.out1(); // 错误，const的成员 不能访问非const的函数

a2.out2();

a2.out3();

return 0;

}