怎么这个总出错啊？新手用什么编译软件啊

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Clock.h
 #include<iostream>
 using namespace std;
 class Clock
 {
 public:
     void SetTime(int newH=0,int newM=0,int newS=0);
     void ShowTime();
     void ShowTime(int n);
 private:
    int Hour;
    int Minute;
    int Second;
 }
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Clock.cpp
 #include "Clock.h"
 void Clock::SetTime(int newH,int newM,int newS)
 {
    Hour=newH;
    Minute=newM;
    Second=newS;
 }
 void Clock::ShowTime()
 {
    cout<<Hour<<":"<<Minute<<":"<<Second<<endl;
 }
 void Clock::ShowTime(int n)
 {
    cout<<Hour<<"点"<<Minute<<"分"<<Second<<"秒"<<endl;
 }
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zhu.cpp
#include "Clock.h"
void main()
 {
    Clock myclock;
    myclock.SetTime(12,5,0);
    myclock.ShowTime();
    myclock.ShowTime(1):
 }
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请大家指教