第五周项目零：阅读程序（4）：const

#include <iostream>
#include <string>
using namespace std;
class Student
{
public:
    Student() {}
    Student( const string& nm, int sc = 0 ): name(nm), score(sc) {}
    //（1）下面的const干神马？定义nm为常数据成员
    void set_student( const string& nm, int sc = 0 )
    {
        name = nm;
        score = sc;
    }

    //（2）下面的const分别干神马？声明常成员函数
    const string& get_name() const
    {
        return name;
    }

    int get_score() const
    {
        return score;
    }
private:
    string name;
    int score;
};

//（3）下面的const干神马？将对象student定义为const
void output_student(const Student& student )
{
    cout << student.get_name() << "\t";
    cout << student.get_score() << endl;
}

int main()
{
    Student stu( "Wang", 85 );
    output_student( stu );
    return 0;
}