77 lines
1.4 KiB
C++
77 lines
1.4 KiB
C++
//设计一个时间类Time，它能够完成秒钟的自增运算。
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#include<iostream>
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using namespace std;
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class Time{
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private:
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int hour,minute,second;
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public:
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Time(int h,int m, int s);
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Time operator++();
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//友元重载需要参数
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friend Time operator--(Time &t);
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void display();
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};
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Time::Time(int h, int m, int s){
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hour=h;
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minute=m;
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second=s;
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if (hour>=24)
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hour=0;
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if (minute>=60)
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minute=0;
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if (second>=60)
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second=0;
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}
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Time Time::operator++(){
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++second;
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if (second>=60){
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second=0;
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++minute;
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if(minute>=60){
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minute=0;
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++hour;
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if(hour>=24)
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hour=0;
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}
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}
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return *this;
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}
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Time operator--(Time &t){
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--t.second;
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if (t.second<0){
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t.second=59;
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--t.minute;
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if(t.minute<0){
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t.minute=59;
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--t.hour;
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if(t.hour<0)
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t.hour=23;
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}
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}
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return t;
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}
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void Time::display(){
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cout<<hour<<":"<<minute<<":"<<second<<endl;
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}
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int main(int argc, char const *argv[])
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{
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Time t1(23,59,59);
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t1.display();
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++t1; //隐式调用
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t1.display();
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t1.operator++(); //显式调用
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t1.display();
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Time t2(24,60,60);
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t2.display();
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++t2;
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t2.display();
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--t2;
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t2.display();
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system("pause");
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return 0;
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}
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