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]

@yeshello54
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]

@Banfa
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