类的构造函数(1)

/*类的构造函数(1)*/

#include "stdafx.h"
#include <iostream.h>

class Time
{
private:   
    //私有段
    int m_nHour;
    int m_nMin;
    int m_nSecond;
public:   
    //公有段
    //构造函数无返回值，名称是类名
    //进入到构造对象已经存在，无法销毁
    Time()
    {
        init();
        cout << this << "This is Construct" << endl;
    }
   
    //重载构造函数
    Time(int nInitValue)
    {
        m_nHour = nInitValue;
        m_nMin = nInitValue;
        m_nSecond = nInitValue;
        cout << this << "This is Construct" << endl;
    }
   
    //重载构造函数
    Time(int nHour, int nMin , int nSecond = 0)
    {
        m_nHour = nHour;
        m_nMin = nMin;
        m_nSecond = nSecond;
        cout << this << "This is Construct" << endl;
    }
   
    //析构函数无参数，无返回值，名称是~类名
    ~Time()
    {
        cout << this << "This is DesConstruct" << endl;
    }
   
public:
    //各成员函数
    int CheckData()
    {
        if ( (m_nHour >= 0 &&  m_nHour <= 23) &&
            (m_nMin >= 0 &&  m_nMin <= 59) &&
            (m_nSecond >= 0 &&  m_nSecond <= 59)  )
        {
            return 1;
        }
        return 0;   
    }
   
    void init()
    {
        m_nHour = 0;  
        m_nMin = 0;
        m_nSecond = 0;
    }
   
    int GetHour()
    {
        return m_nHour;
    }
   
    int GetMin()
    {
        return m_nMin;
    }
   
    int GetSecond()
    {
        return m_nSecond;
    }
   
    void SetTime(int nHour, int nMin, int nSecond)
    {
        m_nHour = nHour;
        m_nMin = nMin;
        m_nSecond = nSecond;
    }
   
    void SetTime(int nValue )
    {
        m_nHour = nValue;
        m_nMin = nValue;
        m_nSecond = nValue;
    }
};

//全局对象最早构造
Time g_Obj;

int main(int argc, char* argv[])
{
    //由Time类型实例对象   
    Time timeobj = 30;     //等价与Time timeobj(10)   
    Time timeobj1;         //无参构造   
    Time timeobj2(11,26);  //三参数的构造   
   
    cout << "时" << timeobj.GetHour()
         << "分" << timeobj.GetMin() 
         << "秒" << timeobj.GetSecond() << endl;
   
    timeobj.SetTime(10,26,10);
   
    cout << "时" << timeobj.GetHour()
         << "分" << timeobj.GetMin()
         << "秒" << timeobj.GetSecond() << endl;
   
    return 0;
}

好了,就写到这,本人学识有限,难免有出错地方,欢迎指正