高手：这个题的错误提示．．．．

class clock{
private:
    int hour,minute,second;
public:
    void init();
    void update();
    void display();
};
# include <iostream.h>
# include"clock.h"
void clock::int()
{
    hour=minute=second=0;
}
void clock::update()
{
    second++;
    if(second==60){
        second=0;
        minute++;
    }
    if(minute==60){
        minute=0;
        hour++;
    }
    if(hour==24)
        hour=0;
}
void clock::display()
{
    cout<<hour<<":"<<minute<<":"<<second<<endl;
}
# include<iostream.h>
# include"clock.cpp"
void main()
{
    int i;
    clock A,B;
    cout<<"A:"<<endl;
    A.init();
    for(i=0;i<10;i++){
        A.update();
        A.display();
    }
    cout<<"B:"<<endl;
    B.init();
    for(i=0;i<10;i++){
        B.update();
        B.display();
    }
}
报这种错误：C:\Documents and Settings\Administrator\C++\Cpp5.cpp(10) : fatal error C1083: Cannot open include file: 'clock.h': No such file or directory
Error executing cl.exe.