# Ruby Bitwise Operators

## Bitwise Operators

In Ruby, Bitwise operators allow to operate on the bitwise representation of their arguments.

**What is a bit? **

A bit (**B**inary dig**IT**) is the basic unit of information stored in the computing system that exists in two possible states, represented as ON or OFF. In a computer system, the ON state considered as 1 and OFF state considered as 0. These states can be compared with two states of a flip-flop, two states of an electric switch **etc**. These two values 0 and 1 are called Binary digit and these digits are in a specific number system, that is BINARY number system which constructs upon the base of 2.

In decimal number system, a number construct upon the base of 10. Let us see how a decimal number can be constructed -

231=(2 x 10^{2})+(3 x 10^{1})+(1 x 10^{0})

=200+30+1

=231

The binary number system also follows the same concept. The only difference is the base is 2 instead of 10. Let us see how a binary number can be converted into a decimal number -

1011010=(1 x 2^{6})+(0 x 2^{5})+(1 x 2^{4})+(1 x 2^{3})+(0 x 2^{2})+(1 x 2^{1})+(0 x 2^{0})

=(1 x 64) +(0 x 32)+(1 x 16)+(1 x 8)+(0 x 4)+(1 x 2)+(0 x 1)

=64+0+16+8+0+2+0

=90

So, (1011010)_{2}= (90)_{10}
Byte

A byte is made up of a sequence of bits. A byte consists of eight bits. The maximum value of a byte is 255, so the place value of each bit is set.

Tabular representation of a byte1 Byte ( 8 bits ) | ||||||||
---|---|---|---|---|---|---|---|---|

8th | 7th | 6th | 5th | 4th | 3rd | 2nd | 1st | |

Place value | 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |

Here is a Tabular representation of a byte shows how the maximum value of a byte is 255

1 Byte ( 8 bits ) |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|

Place Value | 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 | ||

1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |||

2^{7} |
2^{6} |
2^{5} |
2^{4} |
2^{3} |
2^{2} |
2^{1} |
2^{0} |
|||

128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 | = | 255 |

A decimal number 93 can be represent in binary form like bellow -

1 Byte ( 8 bits ) |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|

Place Value | 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 | ||

0 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | |||

2^{7} |
2^{6} |
2^{5} |
2^{4} |
2^{3} |
2^{2} |
2^{1} |
2^{0} |
|||

0 | 64 | 0 | 16 | 8 | 4 | 0 | 1 | = | 93 |

Following Bitwise operators supported by Ruby language

Operator | Name | Example | Result |
---|---|---|---|

& | And | x &y | Bits that are set in both x and y are set. |

| | Or | x | y | Bits that are set in either x or y are set. |

^ | Xor | x ^ y | Bits that are set in x or y but not both are set. |

~ | Not | ~x | Bits that are set in x are not set, and vice versa. |

<< | Shift left | x <<y | Shift the bits of x, y steps to the left.# |

>> | Shift right | x >>y | Shift the bits of x, y steps to the right.* |

# Each step means 'multiply by two'

* Each step means 'divide by two'

**Example: Ruby bitwise operator**

```
puts ("bitwise operators in Ruby")
a = 58 # 00111010
b = 34 # 00100010
puts ("Binary AND Operator")
puts (a&b)
puts ("Binary OR Operator")
puts (a|b)
puts ("Binary OR Operator")
puts (a^b)
puts ("Binary Ones Complement Operator")
puts (~a)
puts ("Binary Left Shift Operator")
puts (a<<4)
puts ("Binary Right Shift Operator")
puts (a>>4)
```

Output:

bitwise operators in Ruby Binary AND Operator 34 Binary OR Operator 58 Binary OR Operator 24 Binary Ones Complement Operator -59 Binary Left Shift Operator 928 Binary Right Shift Operator 3

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Ruby Parallel Assignment

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Ruby Logical Operators

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