C++primer plus第六版课后编程题答案11.4

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mytime.h

#ifndef MYTIME_h_#define MYTIME_h_#include <iostream>//为了方便我全部写成inline函数了class Time{private:int hours;int minutes;public:Time(){hours=minutes=0;};Time(int h,int m=0){hours=h;minutes=m;};void Reset(int h=0,int m=0){hours=h;minutes=m;};Time operator+(const Time &t)const{int jinwei=0;int newh=hours+t.hours;int newm=minutes+t.minutes;if(newm>60){newm=newm%60;jinwei=1;}newh+=jinwei;return Time(newh,newm);};Time operator+(double m)const//重载+{int jinwei=0;int newm=m+minutes;if(newm>60){newm=newm%60;jinwei=1;}int newh=hours+jinwei;return Time(newh,newm);};Time operator-(const Time &t)const{int jinwei=0;int newh=hours-t.hours;int newm=minutes-t.minutes;if(newm<0){newm=minutes-t.minutes+60;jinwei=-1;}newh+=jinwei;return Time(newh,newm);};Time operator*(double n)const{double totalsource=hours*60+minutes;//原来的分钟数double totalnow=totalsource*n;int newh=totalnow/60;int newm=int(totalnow)%60;//求余必须为intreturn Time(newh,newm);};friend Time operator*(double n,const Time &t){return t*n;};friend Time operator-(const Time &t,double m){double total=t.hours*60+t.minutes;int now=total-m;int newh=now/60;int newm=now%60;//求余必须为intreturn Time(newh,newm);};friend Time operator+(double m,const Time &t){return t+m;}friend std::ostream &operator<<(std::ostream &os,const Time &t){os<<t.hours<<" hours,"<<t.minutes<<" minutes."<<std::endl;return os;};};#endif

main114.cpp

#include<iostream>#include"myTime.h"using namespace std;void main114(){Time t1;Time t2(6,9);Time t3(7);Time t4(4,59);/*构造测试cout<<t1<<endl;cout<<t2<<endl;cout<<t3<<endl;*/Time t5=t1+t2;//cout<<t5<<endl;//t5=t2+t4;//cout<<t5<<endl;//t5=t2+10;//cout<<t5<<endl;//t5=t4*2;t5=t2-t4;cout<<t5<<endl;cin.get();}

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