Time.tick()【exercise17.7】

写出Time的成员函数tick，实现时间按秒数增加，并输出一段给定时长的时间变化.

//Time.h
#ifndef TIME_H
#define TIME_H
class Time{
    public:
        Time(int=23,int=59,int=55);
        
        //get functions
        int getHour();
        int getMinute();
        int getSecond();
        
        //set functions
        void setTime(int,int,int);
        void setHour(int);
        void setMinute(int);
        void setSecond(int);
        
        void printUniversal();
        void printStandard();
        
        void tick(double);
        private:
        void increment();//utility function 
        int hour;
        int minute;
        int second;
};
#endif        

 

//Time.cpp
#include"Time.h"
#include<iostream>
#include<stdexcept>
#include<iomanip>
#include<ctime>//用到clock、time、localtime、asctime函数、宏定义CLOCKS_PER_SEC
using namespace std;

Time::Time(int hour,int minute,int second){
    setTime(hour,minute,second);
} 

int Time::getHour(){
    return hour;
}

int Time::getMinute(){
    return minute;
}

int Time::getSecond(){
    return second;
}

void Time::setHour(int h){
    if(h>=0&&h<=23){
        hour=h;
    }else{
        throw invalid_argument("invalid input of hour\n");
    }
}

void Time::setMinute(int m){
    if(m>=0&&m<=59){
        minute=m;
    }else{
        throw invalid_argument("invalid input of minute\n");
    }
}

void Time::setSecond(int s){
    if(s>=0&&s<=59){
        second=s;
    }else{
        throw invalid_argument("invalid input of second\n");
    }
}

void Time::setTime(int h,int m,int s){
    setHour(h);
    setMinute(m);
    setSecond(s);
}


void Time::printStandard(){
    cout<<setfill('0')<<setw(2)
        <<((getHour()==0||getHour()==12)?12:getHour()%12)<<":"
        <<setw(2)<<getMinute()<<":"
        <<setw(2)<<getSecond()<<((getHour()>12)?" PM":" AM")<<endl;
}

void Time::printUniversal(){
    cout<<setfill('0')
        <<setw(2)<<getHour()<<":"
        <<setw(2)<<getMinute()<<":"
        <<setw(2)<<getSecond()<<endl;
}

void Time::tick(double lastingMinute){//lastingMinute是想要持续输出的时间
    double now,last=0;
    while(1){
        printStandard();//也可以放入下一个if中，让程序隔一秒再输出一次
        now=(double)clock()/CLOCKS_PER_SEC;//clock返回执行程序已过去的“滴答”数//CLOCK_PER_SEC是每秒的“滴答”数
        if(now-last>=1){//时间过了1秒
            increment();//second加1
            last=now;//更新时间
        }
        if(now>lastingMinute*60){
            break;
        }
    }
}

void Time::increment(){
    if(second==59){
        if(minute==59){
            if(hour==23){
                setHour(0);
                setMinute(0);
                setSecond(0);
            }else{
                setHour(hour+1);
                setMinute(0);
                setSecond(0);
            }
        }else{
            setSecond(0);
            setMinute(minute+1);
        }
    }else{
        setSecond(second+1);
    }
}

运行测试

#include "Time.h"
using namespace std;

int main() {
    Time t;
    Time test;
    test.tick(0.1);//0.1分钟的输出
}