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C++ Header Help

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Join Date: Jan 2008

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CoolGamer48 CoolGamer48 is offline

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Re: C++ Header Help

#11

Jul 29th, 2008

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Originally Posted by Aia

Look here

I once read an article that said to use cin.get(). What's wrong with that?

I'm a student. If my statements seem too absolute, feel free to coat them with "In my opinion..." or "I believe...".

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Re: C++ Header Help

#12

Jul 29th, 2008

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Originally Posted by Aia

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Originally Posted by DanDaMan

Now I'm really confused. When I don't include system("PAUSE"); then the console screen just pops up and instantly disappears.

Look here

Or, to keep it on site, look here.

The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes

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Join Date: Jul 2008

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Re: C++ Header Help

#13

Jul 30th, 2008

Cool. Thanks for the info links. But I just have one more question. It was mentioned that

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#define 'new symbol' 'previously known symbol' will make 'new symbol' and 'previously known symbol' look the same to the compiler.

But in the code that I got from n.aggel, there was #define HEADER_H. That's only one symbol, right? Or is it?

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Re: C++ Header Help

#14

Jul 30th, 2008

As was mentioned in one of the links, you can #define something with no value. The only real use for this is to use the symbol in preprocessor if-statements. One example is the #ifndef code blocks that sparked this discussion.

file1.h

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#ifndef FILE_1
#define FILE_1
//the symbol FILE_1 now has a status of being defined, though it has no value
 
//class and function declarations, etc.
#endif
#ifndef FILE_1
#define FILE_1
//the symbol FILE_1 now has a status of being defined, though it has no value

//class and function declarations, etc.
#endif

file2.cpp

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
//FILE_1 not defined
#include "file1.h"//code executed
//FILE_1 defined
#include "file1.h"//code not executed twice
//FILE_1 not defined
#include "file1.h"//code executed
//FILE_1 defined
#include "file1.h"//code not executed twice