demo_8_const_pointer_3.cpp

对于一个初涉VC＋＋的人来书

//************************************************

# include <iostream.h>

class Student
{
public:
	Student(int n,float s):num(n),score(s){} //构造函数
	void change(int n,float s) {num=n;score=s;}
	void display() const {cout<<num<<" : "<<score<<endl;}
private:
	int num;
    float score;
};

int main()
{
	Student stud(101,78.5);  //声明对象并初始化
	const Student * const p=&stud; //指向常对象的常指针
//	Student const * const p=&stud; //指向常对象的常指针

	p->display(); //常对象只能调用常成员函数

//	p->change(101,88.5);   //Error!
	stud.change(101,88.5); //用对象名引用成员函数改变对象的值
//	p=&Student(101,88.5);  //Error!

	p->display();

	return 0;
}