时间类

#include <iostream>using namespace std;class Time{public:void set_time( );void show_time( );void add_a_sec();void add_a_minute();void add_an_hour();void add_seconds(int);void add_minutes(int);void add_hours(int);private:bool is_time(int, int, int);   //这个成员函数设置为私有的，是合适的，请品味int hour;int minute;int sec;};void Time::set_time( ){char c1,c2;cout<<"请输入时间(格式hh:mm:ss)";while(1){cin>>hour>>c1>>minute>>c2>>sec;if(c1!=':'||c2!=':')cout<<"格式不正确，请重新输入"<<endl;else if (!is_time(hour,minute,sec))cout<<"时间非法，请重新输入"<<endl;elsebreak;}}void Time::show_time( ){cout<<hour<<":"<<minute<<":"<<sec<<endl;}bool Time::is_time(int h,int m, int s){if (h<0 ||h>24 || m<0 ||m>60 || s<0 ||s>60)return false;return true;}void Time::add_an_hour(){    if(hour<24)    {        hour++;    }    else    {        cout<<"输入错误"<<endl;    }}void Time::add_a_minute(){    if(minute<60)    {        minute++;        if(minute>60)        {            hour++;            minute=minute-60;        }    }    else{cout<<"输入错误";}}void Time::add_a_sec(){    if(sec<60)    {        sec++;        if(sec>60)        {            minute++;            if(minute>60)            {                hour++;                minute=minute-60;                sec=sec-60;            }        }    }    else{cout<<"输入错误";}}void Time::add_seconds(int n){    if(sec+n<60)    {        sec=sec+n;        if(sec>60)        {            minute++;            if(minute>60)            {                hour++;                minute=minute-60;                sec=sec-60;            }        }    }    else{cout<<"输入错误";}}void Time::add_minutes(int n){    if(minute<60)    {        minute=minute+n;        if(minute>60)        {            hour++;            minute=minute-60;        }    }    else{cout<<"输入错误";}}void Time::add_hours(int n){    if(hour+n<=24)    {        hour=hour+n;    }    else{cout<<"输入错误";}}int main( ){    int a;Time t1;t1.set_time( );t1.show_time( );    cout<<"1 增加一秒";    t1.add_a_sec();    t1.show_time( );    cout<<"2 增加一分";    t1.add_a_minute();    t1.show_time( );    cout<<" 3增加一小时";    t1.add_an_hour();    t1.show_time( );    cout<<"4 请输入你要增加的秒数";    cin>>a;    t1.add_seconds(a);    t1.show_time( );    cout<<"5 请输入你要增加的分钟数";    cin>>a;    t1.add_minutes(a);    t1.show_time( );        cout<<"6 请你输入你要增加的小时数";    cin>>a;    t1.add_hours(a);    t1.show_time( );return 0;}