题目内容
写出程序运行结果:_________#include using namespace std;class Clock {public: Clock(int hour = 0, int minute = 0, int second = 0); void showTime() const; Clock& operator ++ (); Clock operator ++ (int);private: int hour, minute, second;};Clock::Clock(int hour, int minute, int second) { if (0 <= hour && hour < 24 && 0 <= minute && minute < 60 && 0 <= second && second < 60) {this->hour = hour;this->minute = minute;this->second = second; } elsecout << "Time error!" << endl;}void Clock::showTime() const { cout << hour << ":" << minute << ":" << second << endl;}Clock & Clock::operator ++ () { second++; if (second >= 60) {second -= 60;minute++;if (minute >= 60) {minute -= 60;hour = (hour + 1) % 24;} } return *this;}Clock Clock::operator ++ (int) { Clock old = *this; ++(*this); return old;}int main() { Clock myClock(23, 59, 59); cout << "First time output:"; myClock.showTime(); cout << "Show myClock++:"; (myClock++).showTime(); cout << "Show ++myClock:"; (++myClock).showTime(); return 0;}
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