Programming Forums > Application Development > C++

alphonso · Apr 2nd, 2006, 10:57 AM

How does one make a header file? It's not as simple as saving the file as a header (.h) file is it? What do I have to do to?

Polyphemus_ · Apr 2nd, 2006, 11:47 AM

Well... it's just like you said: you save a header file as .h, just as you save a source file as .cpp.

DaWei · Apr 2nd, 2006, 11:51 AM

Just don't put source code in a header file. Investigate the function of the preprocessor (# statements).

Seif · Apr 2nd, 2006, 1:46 PM

After you've created a header file, if you want to include it in a project do this:

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 #include ".\headername.h"

Polyphemus_ · Apr 2nd, 2006, 2:17 PM

You don't need the .\

nnxion · Apr 2nd, 2006, 3:17 PM

A short example:

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/* header.h */
#ifndef HEADER_H
#define HEADER_H

void func1(void);

void func2(int start);

void func3(int start, int end);

#endif

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/* module.cpp */
#include <iostream>
#include "header.h"

using namespace std;

void func1()
{
	int i;

	for(i = 0; i < 10; i++)
		cout << i << endl;
}

void func2(int start)
{
	int i;

	for(i = 0; i < 10; i++)
		cout << i << endl;
}

void func3(int start, int end)
{
	int i;

	for(i = start; i < end; i++)
		cout << i<< endl;
}

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/* main.cpp */
#include <iostream>
#include "header.h"

using namespace std;

int main()
{
	cout << "start" << endl;
	func1();
	func2(5);
	func3(10, 20);
}

DaWei · Apr 2nd, 2006, 8:07 PM

I live in dot slash central NY.

alphonso · Apr 3rd, 2006, 2:42 AM

I see...So the functions I type in have to be of void type?

nnxion · Apr 3rd, 2006, 4:29 AM

Quote:

Originally Posted by alphonso

I see...So the functions I type in have to be of void type?

Oh my goodness, it's an example, didn't I just say that? Just test and see if it works on other functions. (Hint: It will.)

alphonso · Apr 5th, 2006, 6:40 AM

Quote:

Originally Posted by nnxion

Oh my goodness, it's an example, didn't I just say that? Just test and see if it works on other functions. (Hint: It will.)

Ok ok, I'm just asking based on what I see. Sheesh, no need to turn into a grumpy old man or something.

Apr 2nd, 2006, 10:57 AM	#1
alphonso Programmer Join Date: Dec 2005 Location: Philippines, where the seasons are: hot, and hotter Posts: 72 Rep Power: 3	making a header file How does one make a header file? It's not as simple as saving the file as a header (.h) file is it? What do I have to do to? __________________ "The most incomprehensible idea about the universe is that it is comprehensible" - Albert Einstein

Apr 2nd, 2006, 11:51 AM	#3
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Just don't put source code in a header file. Investigate the function of the preprocessor (# statements). __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Apr 2nd, 2006, 1:46 PM	#4
Seif Hobbyist Programmer Join Date: Jan 2006 Location: UK Posts: 242 Rep Power: 3	After you've created a header file, if you want to include it in a project do this: (Toggle Plain Text) #include ".\headername.h" #include ".\headername.h"

Apr 2nd, 2006, 3:17 PM	#6
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	A short example: (Toggle Plain Text) /* header.h / #ifndef HEADER_H #define HEADER_H void func1(void); void func2(int start); void func3(int start, int end); #endif / header.h / #ifndef HEADER_H #define HEADER_H void func1(void); void func2(int start); void func3(int start, int end); #endif (Toggle Plain Text) / module.cpp / #include <iostream> #include "header.h" using namespace std; void func1() { int i; for(i = 0; i < 10; i++) cout << i << endl; } void func2(int start) { int i; for(i = 0; i < 10; i++) cout << i << endl; } void func3(int start, int end) { int i; for(i = start; i < end; i++) cout << i<< endl; } / module.cpp / #include <iostream> #include "header.h" using namespace std; void func1() { int i; for(i = 0; i < 10; i++) cout << i << endl; } void func2(int start) { int i; for(i = 0; i < 10; i++) cout << i << endl; } void func3(int start, int end) { int i; for(i = start; i < end; i++) cout << i<< endl; } (Toggle Plain Text) / main.cpp / #include <iostream> #include "header.h" using namespace std; int main() { cout << "start" << endl; func1(); func2(5); func3(10, 20); } / main.cpp */ #include <iostream> #include "header.h" using namespace std; int main() { cout << "start" << endl; func1(); func2(5); func3(10, 20); } __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

Apr 2nd, 2006, 8:07 PM	#7
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	I live in dot slash central NY. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Apr 2nd, 2006, 11:47 AM	#2
Polyphemus_ Expert Programmer Join Date: Aug 2005 Location: Rotterdam, the Netherlands Posts: 942 Rep Power: 4	Well... it's just like you said: you save a header file as .h, just as you save a source file as .cpp.

Apr 2nd, 2006, 2:17 PM	#5
Polyphemus_ Expert Programmer Join Date: Aug 2005 Location: Rotterdam, the Netherlands Posts: 942 Rep Power: 4	You don't need the .\

Apr 3rd, 2006, 2:42 AM	#8
alphonso Programmer Join Date: Dec 2005 Location: Philippines, where the seasons are: hot, and hotter Posts: 72 Rep Power: 3	I see...So the functions I type in have to be of void type? __________________ "The most incomprehensible idea about the universe is that it is comprehensible" - Albert Einstein

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Programming Forums > Application Development > C++

making a header file