Lpc2000

Klaus,

> The difference between long and int is machine dependend.

Actually, it is compiler defined.

> int depends from the processor type, that means int is 16 bit on a 16
> bit machine and 32 bit on a 32 bit machine.

int is supposed to mirror the natural word width of the machine, yes.

> long is at least 32 bit.

Correct.

> short is allways 16 bit.

No, short is required to cover the closed interval [-32768, 32767].
That does not infer 16 bitness for short--short *can* be modeled with a
32-bit type (cf 320C40 compiler cited in a previous message).

> The best way to write portable code is to define your own datatypes.
> 
> i.e. for a 32 bit architecture
> 
> #define u8 unsigned char
> #define u16 unsigned short
> #define u32 unsigned int

Or try <stdint.h> and use uint_8 and so on...

-- Paul.