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hapa_at_1 29Oct2006 00:16
help on masking
 
how does masking works in c++
how can i extract the position of my desire from a series of bits given to me

for instance if

16 in bit is

10000
how can i get the 3rd number
please adivce

shabbir 29Oct2006 10:43
Re: help on masking
 
You need to do the Bitwise AND (&) / Bitwise OR (|) to do the masking

Truth table is as follows
OR
Code:
+-----+-----+-----+
| OP1 | OP2 | O/P |
+-----+-----+-----+
|  0  |  0  |  0  |
|  0  |  1  |  1  |
|  1  |  0  |  1  |
|  1  |  1  |  1  |
+-----+-----+-----+
AND
Code:
+-----+-----+-----+
| OP1 | OP2 | O/P |
+-----+-----+-----+
|  0  |  0  |  0  |
|  0  |  1  |  0  |
|  1  |  0  |  0  |
|  1  |  1  |  1  |
+-----+-----+-----+
Or it with all Zeros and you get the the masked digit or AND it with 1.


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