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The OP pm'ed me. I think it may be a translation problem. He wants to see which bit is set 0 - 31 or ( 1 - 32). Anyway, that is my take on it.

CHAR_BIT is 8 per C99 standard.

if you want to see which bit is set:


if(value & 1 ) -> true if first bit is set
if(value & 2 ) second bit
if(value & 4) third
if(value & 8) fourth
if(value & 16) fifth
... and so on

Your answer still was not clear. I think you want this:

x = x ^ mask;
(or x ^= mask;)
Bits that are set to 1 in the mask will be flipped in x.
Bits that are set to 0 in the mask will be...

Kinda vague - do you want to turn the bit on? off? flip the bit?