C89 or C99

**talin** · 05-26-2008

Hay there!

Not sure whether I should write C89 or C99... I've been using C89 so far.
How do I know when C99 is "available" for use? Does that only depend
on the compiler, or compiler and libraries etc?

I like that C99 has larger ints... other than that, I don't know much about
the differences... I know that

Code:

for (int x = 0; ... ; ...) { ... }

is allowed...
Any other interested things? Also, are "evil" functions such as atoi() still
available in C99? Have they deprecated anything at all?

I use gcc on Linux/FreeBSD and Mingw on Windows.

**Elysia** · 05-26-2008

Originally Posted by talin

How do I know when C99 is "available" for use? Does that only depend
on the compiler, or compiler and libraries etc?

Yes. Some compilers supports it, some does not. For example, GCC does support C99.

I like that C99 has larger ints... other than that, I don't know much about
the differences... I know that

Code:

for (int x = 0; ... ; ...) { ... }

is allowed...
Any other interested things?

Well...

Code:

int n = 5;
int myarray[n];

...works fine in C99.

Also, are "evil" functions such as atoi() still
available in C99? Have they deprecated anything at all?

Still available.

**root4** · 05-26-2008

I like that C99 has larger ints... other than that, I don't know much about
the differences

Here's a quick summary:
http://home.datacomm.ch/t_wolf/tw/c/c9x_changes.html

and the current support status for gcc:
http://gcc.gnu.org/c99status.html

**matsp** · 05-26-2008

Originally Posted by Elysia

Well...

Code:

int n = 5;
int myarray[n];

...works fine in C99.

Technically, I think what you describe is a compiler extension. In C99, it is required that you have "const int n = 5" - whilst gcc and MS also support you doing something like this:

Code:

   int n;
   scanf("%d", &n);
   int array[n];

--
Mats

**Elysia** · 05-26-2008

Oh ho! So people have been using compiler extensions all this time!
Interesting.

**laserlight** · 05-26-2008

Technically, I think what you describe is a compiler extension. In C99, it is required that you have "const int n = 5" - whilst gcc and MS also support you doing something like this:

No, C99 really does allow for variable length arrays, though in the case of g++ it was ported over as a C++ compiler extension.

**talin** · 05-26-2008

Ah, great. Thanks for all the answers!

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