Bit manipulation is important to know when doing data compression, cryptography and optimization.

Bitwise operations include AND, NOT, OR, XOR and bit shifts.

Go supported bit operations incluse:

& AND
| OR
^ XOR
&^ AND NOT
<< left-shift
>> right-shift

Go does not have a dedicated NOT operator like C++ or Python. Instead we have to use the XOR operator to toggle the bits.

var n byte = 0x0F
fmt.Printf("%08b\n", n)
n = ^n
fmt.Printf("%08b\n", n)

This is the output:

00001111
11110000

Here are some common bit manipulation algorithms that can be done in Go

- Swapping integers using XOR since XOR will result in 1 only if both bits are the same.

func swap(a, b int) (int, int) {
a = a ^ b
b = b ^ a
a = a ^ b
return a, b
}

func flip(a int) int{
a ^= 0xFFFFFFFF
return a
}

func isEven(n int) bool{
if n&1 == 1 {
return false
}
return true
}

- Find if a number is power of 2

func isPowerofTwo(n int) bool{
if (n & (n-1) == 0){
return true
}
return false
}

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## Published by Maria DeSouza

I'm a Software Engineer and love all things technology!
View all posts by Maria DeSouza