此程序为何运行不出来结果请大家有空帮忙解决？运行之后是垃圾值为啥,该怎么处理

此程序为何运行不出来结果请大家有空帮忙解决？运行之后是垃圾值为啥
# include <iostream.h>

class Clock
{
public:
Clock(int NewH=0,int NewM=0,int NewS=0) { int Hour=NewH; int Minute=NewM; int Second=NewS; }
void ShowTime();
void operator++();
void operator++(int);
private:
int Hour,Minute,Second;
};

void Clock::operator++()
{
Second++;
if(Second>=60)
{
Second=Second-60;
Minute++;
if(Minute>=60)
{
Minute=Minute-60;
Hour++;
Hour=Hour%24;
}
}
cout<<"++Clock:";
}

void Clock::operator++(int)
{
Second++;
if(Second>=60)
{
Second=Second-60;
Minute++;
if(Minute>=60)
{
Minute=Minute-60;
Hour++;
Hour=Hour%24;
}
}
cout<<"Clock++:";
}

void Clock::ShowTime()
{
cout<<Hour<<":"<<Minute<<":"<<Second<<endl;
}

void main()
{
Clock myClock(12,20,50);
cout<<"First time output:";
myClock.ShowTime();
myClock++;
myClock.ShowTime();
++myClock;
myClock.ShowTime();
}

[解决办法]

C/C++ code

#include <iostream>   using namespace std;  class Clock{public:    //Clock(int NewH=0,int NewM=0,int NewS=0) { int Hour=NewH; int Minute=NewM; int Second=NewS; }    Clock(int NewH=0,int NewM=0,int NewS=0) { Hour=NewH; Minute=NewM; Second=NewS; }    void ShowTime();    void operator++();    void operator++(int);private:    int Hour,Minute,Second;};void Clock::operator++(){    Second++;    if(Second>=60)    {        Second=Second-60;        Minute++;        if(Minute>=60)        {            Minute=Minute-60;            Hour++;            Hour=Hour%24;        }    }    cout<<"++Clock:";}void Clock::operator++(int){    Second++;    if(Second>=60)    {        Second=Second-60;        Minute++;        if(Minute>=60)        {            Minute=Minute-60;            Hour++;            Hour=Hour%24;        }    }    cout<<"Clock++:";}void Clock::ShowTime(){    cout<<Hour<<":"<<Minute<<":"<<Second<<endl;}void main(){    Clock myClock(12,20,50);    cout<<"First time output:";    myClock.ShowTime();    myClock++;    myClock.ShowTime();    ++myClock;    myClock.ShowTime();}
[解决办法]
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# include <iostream.h>

class Clock
{
public:
Clock(int NewH=0,int NewM=0,int NewS=0) { int Hour=NewH; int Minute=NewM; int Second=NewS; }
void ShowTime();
void operator++();
void operator++(i……