bitwise operations.

yeshello54

Hey everyone. Quick question. Say I have a hex string = "6c". I want to be able to turn that into a bit representation of 0000 0000. would i have to convert it to a integer first then do some sort of left shift on it?? Thanks.

JosAH

Quote:

Originally Posted by yeshello54

Hey everyone. Quick question. Say I have a hex string = "6c". I want to be able to turn that into a bit representation of 0000 0000. would i have to convert it to a integer first then do some sort of left shift on it?? Thanks.

You first want to convert that string value to a number; the string must be interpreted as a hexadecimal number. The *scanf family of functions can do it; read here about them.

The next step is to create a string that represents a binary representation of the number. The *printf family of functions can't help you (they only do octal, decimal or hexadecimal representations of a number). A bit of bit shifting can do the job though.

kind regards,

Jos

whodgson

In the context if what JosAH has said
The following algotithm will perform the transformation also.
1. make the 4 LH bits equal to the LH hex numeral or letter.
2. make the next 4 bits equal the next hex numeral or letter
3. repeat 2 above until the hex integer is exhausted.

e.g. convert 0x 5 d 2 3 f a
bin equivalent is 0101 1101 0010 0011 1111 1010

hth's

Banfa

I find it hard to believe that you are recommending using a *scanf function Jos, I personally have always believed that they are a curse on the C language.

Myself I would use strtol

JosAH

Quote:

Originally Posted by Banfa

I find it hard to believe that you are recommending using a *scanf function Jos, I personally have always believed that they are a curse on the C language.

Myself I would use strtol

The *scanf functions do their job if used correctly; I agree, when used as interactive lexical analyzers they feel like acute diarrhea with no toilet in the vicinity.

kind regards,

Jos

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