Subtopic: Bitwise operations Bitwise examples Some bitwise problems
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Subtopic: Bitwise operations Bitwise examples Some bitwise problems
Applications: - Compact storage of status data. - Storage of sets. - Arithmetic at
hardware level. - Systems programming. David Keil 1/03 3. Shift-left operator.
1. Types, loops, subprograms
1/03
1
C/C++ Operation operator
Shift-left-3 multiplies by 8 because 2 3 = 8 1/03
1/03
2
Example
Complement
~
~ 100000002 = 011111112
OR
|
11002 | 10012 = 11012
AND
&
11002 & 1001 2 = 10002
Left shift
> 2 = 1102
XOR
^
10012 ^ 10102 = 0011 2
3
Some bitwise problems
David Keil
1/03
4
Setting a bit to 1 with OR • To set nth bit of a number, create a mask by shifting a 1 left (n − 1) times, and then bitwise-OR the number with the mask.
