类的学习

#include
     
      #include
      
       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;}
      
     

练习1

#include
     
      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;}
     

练习2

#include
     
      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();}