1-23 类

#include<iostream>
#include<string>

using namespace std;


class Cperson
{
public:
    string Name;
    int *p;
//构造函数与类同名，可以有参数也可以没有参数
//无返回值
//在创建对象时一定会调用的函数
    //类里面默认一个构造函数，无参数
    //构造函数的作用是给成员变量赋值
    Cperson()
    {
        cout << "Cperson()" << endl;
        p = new int[3];
    }
    //析构函数,反向的构造函数
    //在对象被回收时，一定会被调用的函数
    //在一个类里只有一个
    //省略了回收空间的操作，防止忘记
    ~Cperson()
    {
        delete [ ] p;
        cout << "~Cperson()" << endl;
    }
private:
    int m_BankPassword;
public:
    int GetPassWord()
    {
        return m_BankPassword;
    }
};

int main()
{
    Cperson ps;
    ps.GetPassWord();
    return 0;
}

#include<iostream>
using namespace std;

class CStudent
{
public:
    int id;
    int m_Chinese;
    int m_Math;

    CStudent(int ID, int a, int b)
    {
        id = ID;
        m_Chinese = a;
        m_Math = b;
    }
    int Average()
    {
        return (m_Chinese + m_Math) / 2;
    }
    bool IsPass()
    {
        if (m_Chinese < 60 || m_Math < 60)
        {
            return false;
        }
        return true;
    }
};

int main()
{
    int id;
    int m_ch;
    int m_ma;
    cin >> id >> m_ch >> m_ma;
    CStudent st1(id,m_ch,m_ma);
    cout << st1.Average() << endl;
    if (st1.IsPass())
    {
        cout << "pass" << endl;
    }
    else
    {
        cout << "not pass" << endl;
    }

    return 0;
}

#include<iostream>
using namespace std;

class Timer
{
public:
    int h;
    int m;
    int s;
    void GetTime(int hour,int minute,int second)
    {
        h = hour;
        m = minute;
        s = second;
    }
    void ShowTime()
    {
        if (h < 24 || h >= 0 || m < 60 || m >= 0 || s < 60 || s >= 0)
        {
            cout << h << ":" << m << ":" << s << endl;
        }
    }
};
int main()
{
    Timer st;
    st.GetTime(23, 34, 56);
    st.ShowTime();
}