C syntax: unsigned myvar;

lordmule · 07-19-2009, 06:41 PM

Hi there,
just a quick question, what happens to variables of this kind in C compiler, defaults to system int?

I am just adapting the zlib compression example zpipe.c:

Code:

int ret, flush;
unsigned have;
z_stream strm;
...
   have = CHUNK - strm.avail_out;
   if (fwrite(out, 1, have, dest) != have || ferror(dest)) {

also just a guide on etiquette in posting on this forum, is there a syntax section for quickie questions like this?

thanks

Spidey · 07-19-2009, 06:46 PM

Quote:

unsigned have;

If your referring to an unsigned int, it is basically an int which can only hold positive values.
The default in C is the signed int which allows you to hold both negative and positive values.

lordmule · 07-19-2009, 08:27 PM

Quote:

Originally Posted by Spidey

If your referring to an unsigned int

You may have overlooked my question. I am referring to "unsigned" alone...What is it's intended meaning. if "unsigned" converts to "unsigned int" then which C syntax does this conform to?

tabstop · 07-19-2009, 08:35 PM

Quote:

Originally Posted by lordmule

You may have overlooked my question. I am referring to "unsigned" alone...What is it's intended meaning. if "unsigned" converts to "unsigned int" then which C syntax does this conform to?

The part of the C syntax that says that "unsigned" and "unsigned int" refer to the same type (in the same way that "int" and "signed int" refer to the same type).

lordmule · 07-22-2009, 02:28 PM

excellent. thanks for that.

Tux0r · 07-23-2009, 12:15 AM

Quote:

Originally Posted by lordmule

excellent. thanks for that.

Note however that this does not stop you from saying unsigned char for example.

07-19-2009, 06:41 PM	#1
lordmule Registered User Join Date: Jun 2008 Posts: 8	C syntax: unsigned myvar; Hi there, just a quick question, what happens to variables of this kind in C compiler, defaults to system int? I am just adapting the zlib compression example zpipe.c: Code: int ret, flush; unsigned have; z_stream strm; ... have = CHUNK - strm.avail_out; if (fwrite(out, 1, have, dest) != have \|\| ferror(dest)) { also just a guide on etiquette in posting on this forum, is there a syntax section for quickie questions like this? thanks
lordmule is offline

07-22-2009, 02:28 PM	#5
lordmule Registered User Join Date: Jun 2008 Posts: 8	excellent. thanks for that.
lordmule is offline

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