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Give a very good method to count the number of ones in a 32
bit number.
(caution: looping through testing each bit is not a solution)
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Answer Posted / sunny arora
/* This is a table which will contain number of ones
corrosponding to number value */
static int bits_in_char [256] ;
int bitcount (unsigned int n)
{
// works only for 32-bit ints
return bits_in_char [n & 0xffu]
+ bits_in_char [(n >> 8) & 0xffu]
+ bits_in_char [(n >> 16) & 0xffu]
+ bits_in_char [(n >> 24) & 0xffu] ;
}
| Is This Answer Correct ? | 9 Yes | 9 No |
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