Coding a binary data

C doesn't support binary numerical constants (see K&R). Perhaps a simple macro could help:

#define BIN(b7,b6,b5,b4,b3,b2,b1,b0) ((b0)+((b1)<<1)+((b2)<<2)+((b3)<<3)+((b4)<<4)+((b5)<<5)+((b6)<<6)+((b7)<<7))

Then your constant would look like this:

int i = BIN(1,0,0,1,0,1,0,1);

Of course, you can extend the macro to suport a greater number of bits.
Regards,
Mike.

The ANSI 'C' language does have a binary data notation.

I suppose you could do something with the preprocessor if it's really important to you; eg,

#define B_0000_0000 0x00
#define B_0000_0001 0x01
#define B_0000_0010 0x02
#define B_0000_0011 0x03
#define B_0000_0100 0x04

etc

#define B_1111_1101 0xfd
#define B_1111_1110 0xfe
#define B_1111_1111 0xff

#define LongToBin(n) \ 
(\ 
((n >> 21) & 0x80) | \ 
((n >> 18) & 0x40) | \ 
((n >> 15) & 0x20) | \ 
((n >> 12) & 0x10) | \ 
((n >>  9) & 0x08) | \ 
((n >>  6) & 0x04) | \ 
((n >>  3) & 0x02) | \ 
((n      ) & 0x01)   \ 
)

#define Bin(n) LongToBin(0x##n##l)

A very elegant macro! Has its limitations, though (max. number of bits). But the idea is great.

Nice idea. By the way <pre&gt and </pre&gt need to be lower case.

When I said,

"The ANSI 'C' language does have a binary data notation"

what I meant was, of course,

"The ANSI 'C' language does not have a binary data notation"