Thread: #define format...

Originally Posted by citizen

First, if you are writing this you need to decide if the macro is truly necessary, because it probably isn't.

Code:

const int MENUITEM1 = 1;
const int MENUITEM2 = 2;
const int MENUITEMn = n; ...

Even if it is necessary, write your constant in whatever base you want as long as you don't confuse anyone who will read your code, and be consistant with the base you choose. Don't define a hex number and then use it with decimals.

http://code-dynasty.net/articles/C_A...ming/83#Macros

Originally Posted by Raigne

what is the conversion formula from hex to int (just wandering cuzz I just use random hex numbers in my code)

You seem a mite confused about hex.
Google some on it, things like "number system", "hex to decimal tutorial", etc.
Here's a link to start with.

Basically, decimal, the system you use, is base 10. 10 symbols (the numbers 0 to 9) per digit in the number. Hexadecimal is base 16, so 16 symbols per digit in the number, represented by the numbers 0-9 and letters A-F. The above link will show you how to convert between the two.
Hexadecimal, binary, and decimal (among others) are all different ways of representing the same values.

Still looking for your point, Desolation.

Huhh.. I guess I didn't make it obvious that what I wanted to say is that sometimes you shouldn't just base your coding on what people tell you. Some will tell you this or that is a bad habit. Hell, using goto will get you flamed but it has its uses. I never needed it but if I ever feel I need it, I'll use it.

Yeah it would work.. and yes there is a 9 symbol in octo... 09 would be understood as a base 10 integer and 0x9 is correct.

Simple test:

Code:

   int value = 09;
/*
Error: Illegal octal digit in function main
*/

any must have heard how "it's better to use const variables than macros" and this is where I say that it's not true. There is really no advantage. The choice is yours. Really.

What utter nonsense. Macros are not properly typed, you cannot take their address, and most of all they're not scoped!

However, in this particular case macros are probably better, because such definitions are usually within a resource header that is also included by the resource compiler, and the resource compiler doesn't understand constants.