bits in C

I do not know how to refer to bits in C and i need an example.Do i refer as char or as int.I do not know basic commands in bits.
I just need an example...

http://www.cprogramming.com/tutorial...operators.html does a pretty damn good job.

You should read up about 'bitwise operators' in C. There should be a tutorial here about it.

For example if you want to check if the 32 bit in a byte is on you could use the bitwise 'and' opetator:

Code:

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if(somenumber & 32)

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For setting a bit I would check if its set first, if not then just add the bit value to it.

Code:

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if(!(somenumber & 32))somenumber+=32;

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This may not be the best way to do this tho.

Quote:

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Originally Posted by mike_g

For example if you want to check if the 32 bit in a byte is on you could use the bitwise 'and' opetator:

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Not to be pedantic, but a byte doesn't have a 32nd bit on most architectures. :p

The tutorial covers all that in depth, and explains there's 8 bits to a byte, usually ;)

Er... I said 32 bit, not 32nd, but I guess it could seem confusing. I usually talk like that anyway with binary stuff and break ints down into octects. Plus it meant that I dident have to go into bitshifting with my explanation. But yeah, i'm sure the tutorial is better than my vague explanation.

Ohh, I see where your coming from. Checking if the 32nd bit is on in a set of bytes, ie a byte (if you break it down)?

Quote:

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For setting a bit I would check if its set first, if not then just add the bit value to it.

Code:

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if(!(somenumber & 32))somenumber+=32;

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This may not be the best way to do this tho.

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Or or:

Code:

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somenumber |= 32;

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Yeah, ORing its better. I forgot that :(

Quote:

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Originally Posted by MacGyver

Not to be pedantic, but a byte doesn't have a 32nd bit on most architectures. :p

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He said "32 bit" not "32nd bit." The 32 bit is the bit with value 32, in other words the fifth bit.

That bit would still be in one byte, as 32 in this case would be bit 5 (starting from bit 0).

I get it now.... I just never think of the 5th (or 6th) bit as the "32 bit". lol....

>I get it now.... I just never think of the 5th (or 6th) bit as the "32 bit". lol....
Me either. I would certainly use hex to write the same expression:

Code:

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if (somenumber & 0x20)

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Or do a bit shift.