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Question about making a .h file for my assignment

jkelly18 (40)
So I have code that is a clock basically. In all of our assignments we need to name it pass(1-8).cpp This one is pass8.cpp. Part of the directions include this

"You should put the class prototype in Clock.h, and implement all the Clock member functions in Clock.cpp. In a third file, main.cpp, write the following code."

Then he says after that that we will compile it with g++ pass8.cpp Clock.cpp

I don't see what the point in the pass8.cpp file is if everything is already in the other three files. Can someone help me out with this as I don't have too much experience with .h files.


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   #include <iostream>
#include <string>
#include <iomanip>

using namespace std;

class Clock
{
private:
	int mHours; //(range 0-23)
	int mMinutes; //(range 0-59)
	int mSeconds; //(range 0-59)
public:
	Clock();
	Clock(int);
	Clock(int, int);
	Clock(int, int, int);
	int getHours()  
		{return mHours;}
	int getMinutes()  
		{return mMinutes;}
	int getSeconds()  
		{return mSeconds;}
	void setHours(int hourValue) {
		if ( hourValue >= 0 && hourValue <23) { 
			mHours = hourValue;
		} else if(hourValue<0) { 
			mHours = 0;
		} else if(hourValue>12) {
			mHours = 12;
		}
	}
	void setMinutes(int minuteValue) {
		if ( minuteValue >= 0 && minuteValue < 60) {
			mMinutes = minuteValue;
		} else {
			mMinutes = 0;
		}	
	}
	void setSeconds(int secondValue) {
		if ( secondValue >= 0 && secondValue < 60) {
			mSeconds = secondValue;
		} else {
			mSeconds = 0;
		}
	}
	bool isMorning();
	bool isAfternoon();
	bool isEvening();
	void tick();
	friend ostream &operator<<(ostream &, Clock&);	
};
	ostream &operator<<(ostream &out, Clock &time){
		string display;	
		if(time.mHours >12)
		{	time.mHours = time.mHours - 12;
			display = "PM";
		}else{
			display = "AM";
		}

		
		out << setfill('0') << setw(2)<<time.mHours;
		out << ":"<<setfill('0')<<setw(2)<< time.mMinutes;
		out << ":"<<setfill('0')<<setw(2)<< time.mSeconds
		<< " "<<display << endl; 
		return out;
}
	Clock::Clock() {
		setHours(12);
		setMinutes(0);
		setSeconds(0);
		}
	Clock::Clock(int hourValue) 
		{setHours(hourValue);}
	Clock::Clock(int hourValue, int minuteValue) 
		{setHours(hourValue);
		setMinutes(minuteValue);}
	Clock::Clock(int hourValue, int minuteValue, int secondValue) 
		{setHours(hourValue);
		setMinutes(minuteValue);
		setSeconds(secondValue);}
	

	bool Clock::isMorning() {
		if ( mHours < 12) {
			return true;
		}else{
			return false;
		}
	}
	bool Clock::isAfternoon() {
		if ( mHours >= 12 && mHours < 18) {
			return true;
		}else{ 
			return false;
		}
	}
	bool Clock::isEvening() {
		if ( mHours < 18) {
			return false;
		}else{
			return true;
		}
	}
	void Clock::tick() {
		if (mSeconds < 60)
			mSeconds = mSeconds + 1;
		else 
			mSeconds = 0;
		if (mMinutes < 60 && mSeconds == 0)
			mMinutes = mMinutes + 1;
		else 
			mMinutes = 0;
		if (mHours < 24 && mMinutes == 0 && mSeconds == 0)
			mHours = mHours + 1;
		else 
			mHours = 0;
		
}
void printTimeMessage(Clock a) {
		
		cout << "The current time is "<< a << endl;
}

int main() {
	
	int hour;
	int minute;
	int second;
	

	cout << "What is the hour?" << endl;
	cin >> hour;
	
	cout << "What is the minute?" << endl;
	cin >> minute;

	cout << "What is the second?" << endl;
	cin >> second;

        Clock a(hour,minute,second);

printTimeMessage(a);

        a.setHours(hour+2);
        a.setMinutes(minute+30);
        a.setSeconds(second+15);
	
	cout << "Back to the Future!"; 
	printTimeMessage(a);

	a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);
        a.tick();
	printTimeMessage(a);

return 0;
}
long double main (999)
The idea here is that you want to do something like
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// Clock.h

// #include guard -- prevents your header file from being #included multiple times
#ifndef CLOCK_H_INCLUDED_ORSOMEOTHERUNIQUENAMEOFYOURCHOICE
#define CLOCK_H_INCLUDED_ORSOMEOTHERUNIQUENAMEOFYOURCHOICE

class Clock
{
    // Member variable/function declarations here
};

#endif 

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// Clock.cpp

#include "Clock.h"
// Whatever other #includes you might need

// Member function definitions here, e.g.
Clock::Clock()
{
    // etc.
}

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// main.cpp

#include "Clock.h"
// Whatever other #includes you need

int main()
{
    // Use Clock here
}

That's how you would split everything into multiple files.
Last edited on
jkelly18 (40)
But what about the main.cpp that he wants?
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