阅读程序

来源：互联网发布：喜马拉雅有mac版吗编辑：程序博客网时间：2024/06/10 07:36

#include <iostream>using namespace std;class Time{public:    Time(int,int,int);    void output_time( );    int hour;    int minute;    int sec;};Time::Time(int h,int m,int s){    hour=h;    minute=m;    sec=s;}void Time::output_time( ){    cout<<hour<<":";    cout<<minute<<":" <<sec<<endl;}int main( ){    Time t1(10,13,56);    int *p1=&t1.hour; //指向数据成员的指针   cout<<*p1<<endl;    t1.output_time( );    Time *p2=&t1; //指向对象的指针    p2->output_time( );    void (Time::*p3)( ); //指向成员函数的指针    p3=&Time::output_time;    (t1.*p3)( );    return 0;}

10:13:56

#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？nm为常对象，不能改变___________    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？___常引用__________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;}

#include<iostream>using namespace std;class myClass{public:    myClass(){ number++;}    ~myClass(){ number--;}    static int number;};int myClass::number=0;int main(){   myClass *ptr;    myClass A,B;    myClass *ptr_Arr=new myClass[3];   ptr=ptr_Arr;    myClass C;    cout<<myClass::number<<endl;   delete []ptr;    return 0;}

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