types of variables and their sizes for WinAVR compiler?

Development Boards MicroMod
1

Hi there,

I think the sizes of int, float, unsigned integer etc. depends on compilers. I have the WinAVR (20080610 June 10, 2008) compiler. But I could not find any manual for it.

Can somebody provide me with the list of types of variables and their sizes for this compiler? I would appreciate that. Thanks

Regards

2

It might not have changed from an earlier version

you may refer an old manual though

3

Instead of listing them all out, determine for yourself

int sz = sizeof(int)

int usz = sizeof(unsigned int)

But I suggest if you’re writing code which depends on certain sizes to use the stdint.h header and the explicit size types:

uint8_t, uint16_t, uint32_t, int16_t, etc etc

4

theatrus:
Instead of listing them all out, determine for yourself

int sz = sizeof(int)

int usz = sizeof(unsigned int)

But I suggest if you’re writing code which depends on certain sizes to use the stdint.h header and the explicit size types:

uint8_t, uint16_t, uint32_t, int16_t, etc etc

Are these specific to WinAVR compiler? For the sake of portability, I would like to stick to the standard data types as they are written like int, unsigned int etc.

Thanks

.

5

stdint.h is part of C99. All GCC releases support a useful subset of C99, and avr-libc does contain a stdint.h implementation.

http://en.wikipedia.org/wiki/Stdint.h

If you choose to only use standard types, you can’t make exact guarantees of their bit size. Some systems even have sizeof(char) == 2, which can be a mind bender.