本题已给出时钟类及其成员函数实现,要求补充完整运算符++重载函数(前置和后置),使之能够实现时钟对象自增1秒。
时钟类定义如下。
class Clock {
public:
Clock(int NewH=0, int NewM=0, int NewS=0);
void ShowTime();
friend Clock operator++(Clock& op); //前置单目运算符重载
friend Clock operator++(Clock& op,int); //后置单目运算符重载
private:
int Hour, Minute, Second;
};
裁判测试程序样例:
#include<iostream>
using namespace std;
class Clock {
public:
Clock(int NewH=0, int NewM=0, int NewS=0);
void ShowTime();
friend Clock operator++(Clock& op); //前置单目运算符重载
friend Clock operator++(Clock& op,int); //后置单目运算符重载
private:
int Hour, Minute, Second;
};
Clock::Clock(int NewH, int NewM, int NewS) {
Hour=NewH;
Minute=NewM;
Second=NewS;
}
void Clock::ShowTime() {
cout<<Hour<<":"<<Minute<<":"<<Second<<endl;
}
/*---------请在这里填写答案-----------*/
int main() {
int h, m, s;
cin>>h>>m>>s;
Clock a(h,m,s);
(++a).ShowTime();
(a++).ShowTime();
a.ShowTime();
return 0;
}
运算符重载函数的定义。
Clock operator++(Clock& op) {
op.Second++;
if (op.Second == 60) {
op.Second = 0;
op.Minute++;
}
if (op.Minute == 60) {
op.Minute = 0;
op.Hour++;
}
if (op.Hour == 24) {
op.Hour = 0;
}
return op;
}
Clock operator++(Clock& op, int) {
Clock t = op;
op.Second++;
if (op.Second == 60) {
op.Second = 0;
op.Minute++;
}
if (op.Minute == 60) {
op.Minute = 0;
op.Hour++;
}
if (op.Hour == 24) {
op.Hour = 0;
}
return t;
}