Extracting A Nibble From A Byte
In C programming language:
#define HI_NIBBLE(b) (((b) >> 4) & 0x0F) #define LO_NIBBLE(b) ((b) & 0x0F)where b must be a variable or constant of an integral data type. (Of course, if b is more than a byte wide, only one of the bytes will be considered).
For example, HI_NIBBLE(0xAB)==0xA and LO_NIBBLE(0xAB)==0xB.
In Common Lisp:
(defun hi-nibble (b) (ldb (byte 4 4) b)) (defun lo-nibble (b) (ldb (byte 4 0) b))Read more about this topic: Nibble
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