Swift - Bitwise Operators


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Bitwise operators work on bits and perform bit by bit operation. The truth tables for &, |, and ^ are as follows −

p q p & q p | q p ^ q
0 0 0 0 0
0 1 0 1 1
1 1 1 1 0
1 0 0 1 1
Assume A = 60; and B = 13;

In binary format, they will be as follows:

A = 0011 1100

B = 0000 1101

-----------------

A & B = 0000 1100

A|B = 0011 1101

A^B = 0011 0001

~A  = 1100 0011

Bitwise operators supported by Swift language are listed in the following table. Assume variable A holds 60 and variable B holds 13, then −

Operator Description Example
& Binary AND Operator copies a bit to the result, if it exists in both operands. (A & B) will give 12, which is 0000 1100
| Binary OR Operator copies a bit, if it exists in either operand. (A | B) will give 61, which is 0011 1101
^ Binary XOR Operator copies the bit, if it is set in one operand but not both. (A ^ B) will give 49, which is 0011 0001
~ Binary Ones Complement Operator is unary and has the effect of 'flipping' bits. (~A ) will give -61, which is 1100 0011 in 2's complement form.
<< Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand. A << 2 will give 240, which is 1111 0000
>> Binary Right Shift Operator. The left operands value is moved right by the number of bits specified by the right operand. A >> 2 will give 15, which is 0000 1111
swift_operators.htm

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