## DEV Community

Moch. Lutfi

Posted on • Originally published at lumochift.org on

# Binary Operator Hack and Tricks

A binary operator is a way to manipulate binary data. We already know there are `&`, `|`, `^`, `<<` and `>>` operators, but not all of us know the secret of each operator. Let's explore what tricks behind those operators using go language.

## Multiply or Divide By 2

Multiply 2 using `* 2` or divide using `/ 2` is the normal way, but how we can achieve the same with the binary operator?

divide by 2 shift right by 1 `someNumber >> 1`
multiply by 2 shift left by 1 `someNumber << 1`
``````    // multiply by 2
fmt.Println(4 << 1)
// Output: 8

// divide by 2
fmt.Println(4 >> 1)
// Output: 2
``````

## Change case of character

``````
// to upper case char
fmt.Println((string)('c' & '_'))
// Output: C

// to lower case char
fmt.Println(string('A' | ' '))
// Output: a
``````

## Invert case of character

Invert char can be achieved by `xor` with space

``````    fmt.Println(string('A' ^ ' '), string('b' ^ ' '))
// Output: a B
``````

## Get letter position

Get a letter's position in the alphabet (1-26) using `and with 31`

``````    fmt.Println('z' & 31)
// Output: 26
``````

## Check number odd or even

Simple check if the number is odd/even using `and with 1`, if the number is odd will return true

``````    // odd number return true
fmt.Println(7 & 1 > 0)
// Output: true

// even number return false
fmt.Println(8 & 1 > 0)
// Output: false

``````

Try it yourself at https://play.golang.org/p/-wsIlDgBTmF