有以下类定义
#include<iostream>
using namespace std;
class Clock{
public:
Clock(int NewH=0, int NewM=0, int NewS=0){Hour=NewH; Minute=NewM;Second=NewS;}
void ShowTime() {cout<<Hour<<":"<<Minute<<":"<<Second;}
Clock operator ++();
private:
int Hour, Minute, Second;};
Clock Clock::operator ++(){
Second++;
if(Second>=60){
Second=Second-60;
Minute++;
if(Minute>=60){
Minute=Minute-60;
Hour++;
Hour=Hour%24;}}
return ________;
}
};
int main() {
Clock c1;
(++c1).ShowTime();
return 0;
}
请为横线处选择合适的程序()使得程序的运行结果是0:0:1。