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How to swap the two nibbles in a byte ?

+7 votes
How to swap the two nibbles in a byte ?
posted Nov 18, 2013 by Anuj Yadav

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2 Answers

+2 votes
Best answer

Previous solution will not work for Negative numbers.
Because when we will do right shift then it will pad it with 1 not 0. So answer will not be correct. For avoiding this we should mask. The perfect answer will be :

#define swapNibble(x) ( (x<<4) & (0xF0) | (x>>4) & (0x0F) )

** If anyone wants more explanation plz comment

answer Nov 22, 2013 by Shekhar P
+2 votes
#define swapNibble(x) ( (x<<4) | (x>>4) )
answer Nov 18, 2013 by Vikas Upadhyay
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