C++ ~ Time类实例研究

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Time类的定义：

类中的定义包含成员函数Time、setTime、printUniversal、printStandard的函数原型，以及private unsigned int成员hour、minute、second。只能通过Time类的成员函数访问它的private数据成员。

下面的例子是我的简单Time类演示代码：

time.h文件

#ifndef __TIME_H__#define __TIME_H__class Time{public:Time();void setTime(int, int, int);void printUniversal() const;void printfStandard() const;private:unsigned int hour;unsigned int minute;unsigned int second;};#endif

time.cpp文件：

#include<iostream>#include<string>#include<iomanip>#include<stdexcept>#include"time.h"using namespace std;Time::Time():hour(0), minute(0), second(0){}void Time::setTime(int h, int m, int s){if ((h >= 0 && h < 24) && (m >= 0 && m < 60) && (s >= 0 && s < 60)){hour = h;minute = m;second = s;}else{throw invalid_argument("number out of range");}}void Time::printUniversal()const{cout << setfill('0') << setw(2) << hour << ":" << setw(2)    //setfill指定输出宽域大于输出整数值所需的填充字符<< minute << ":"<<setw(2) << second;                 //setw控制输出宽域，对紧接显示的值起作用（注意包含头文件<iomanip>）}void Time:: printfStandard() const{cout << ((hour == 0 || hour == 12) ? 12 : hour % 12) << ":"<< setfill('0') << setw(2) << hour << ":" << setw(2) << minute<< ":" << setw(2) << second << (hour < 12 ? "AM" : "PM");}

test.cpp文件：

#include<iostream>#include<string>#include<iomanip>#include<stdexcept>#include"time.h"using namespace std;int main(){Time t;cout << "the init time is: ";t.printUniversal();cout << "\nthe time is: ";t.printfStandard();t.setTime(15, 12, 50);cout << "\n\nthe init time is: ";t.printUniversal();cout << "\nthe time is: ";t.printfStandard();cout << endl;try{t.setTime(50, 12, 50);}catch (invalid_argument &e){cout << "\nException: " << e.what() << endl;}cout << endl;return 0;}

运行结果：

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