第六周实践项目4————静态成员的应用

来源：互联网发布：js rem 编辑：程序博客网时间：2024/05/18 01:54

问题及代码：

/*copyright(c)2016.烟台大学计算机学院   * All rights reserved,   * 文件名称：text.Cpp   * 作者：吴敬超   * 完成日期：2016年4月5日   * 版本号：vc++6.0   *   * 问题描述：静态成员函数 * 输入描述:   * 程序输出： 输出结果   */

#include<iostream>using namespace std;class Time{public:    Time (int =0,int =0,int =0);    void show_time();    void add_second(int );    void add_minute(int );    void add_hours(int );    static void change24();    static void changefrom0();private:    static bool is_24;    static bool from0;    int hour;    int minute;    int sec;};Time::Time(int h,int m,int s){    hour=h;    sec=s;    minute=m;}bool Time::is_24 = true;bool Time::from0 = false;void Time::show_time( ){    if (is_24)    {        if (from0)        {            cout << (hour < 10 ? "0":"") << hour << ':' \            << (minute < 10 ? "0":"") << minute << ':' << (sec < 10 ? "0":"") << sec << endl;        }        else        {            cout << hour << ':' << minute << ':' << sec << endl;        }    }    else    {        if (from0)        {            cout << (hour < 10||(hour - 12 >=0 && hour - 12 < 10) ? "0":"") << (hour > 12 ? hour-12 : hour) << ':' << (minute < 10 ? "0":"") << minute << ':' << (sec < 10 ? "0":"") << sec << ' '  << (hour > 11 ? "pm" : "am") << endl;        }        else        {            cout << (hour > 12 ? hour-12 : hour) << ':'<< minute<< ':' << sec << ' ' << (hour > 11 ? "pm" : "am") << endl;        }    }}void Time::add_second(int s){    sec+=s;    sec=s%60;    add_minute(s / 60);}void Time::add_minute(int m){    minute+=m;    minute=m%60;    add_hours(m / 60);}void Time::add_hours(int h){    h=hour+h;    hour=h%24;}void Time::change24(){    is_24 = !is_24;    if (is_24)        cout << "已切换为24小时制。" << endl;    else        cout << "已切换为12小时制。" << endl;}void Time::changefrom0(){    from0 = !from0;    if (from0)        cout << "已切换为前导0输出。" << endl;    else    cout << "已切换为非前导0输出。" << endl;}int main(){    Time t1(23,14,25),t2(8,45,6);    cout<<"24小时制，不前导0"<<endl;    cout<<"t1是:";    t1.show_time();    cout<<"t2是:";    t2.show_time();    t1.add_hours(10);    t2.add_hours(10);    Time::changefrom0();    cout<<"10小时后，切换是否前导0"<<endl;    cout<<"t1是:";    t1.show_time();    cout<<"t2是:";    t2.show_time();    t1.change24();    cout<<"换一种制式"<<endl;    cout<<"t1是:";    t1.show_time();    cout<<"t2是:";    t2.show_time();    cout<<endl;}

运行结果：

0 0