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bits.ReverseBytes64() Function in Golang with Examples
• Last Updated : 28 Apr, 2020

Go language provides inbuilt support for bits to implement bit counting and manipulation functions for the predeclared unsigned integer types with the help of bits package. This package provides ReverseBytes64() function which is used to find the reversed order of the value of a. To access the ReverseBytes64() function you need to add a math/bits package in your program with the help of the import keyword.

Syntax:

`func ReverseBytes64(a uint64) uint64`

Parameters: This function takes one parameter of uint64 type, i.e., a.

Return Value: This function returns the value of a with its bits in reversed order.

Example 1 :

 `// Golang program to illustrate``// bits.ReverseBytes64() Function`` ` `package main`` ` `import (``    ``"fmt"``    ``"math/bits"``)`` ` `// Main function``func main() {`` ` `    ``// Finding the reverse order of a``    ``// Using ReverseBytes64() function``    ``a := bits.ReverseBytes64(7)``    ``fmt.Printf(``"Reverse order of %d: %b"``, 7, a)`` ` `}`

Output:

`Reverse order of 7: 11100000000000000000000000000000000000000000000000000000000`

Example 2:

 `// Golang program to illustrate``// bits.ReverseBytes64() Function``package main`` ` `import (``    ``"fmt"``    ``"math/bits"``)`` ` `// Main function``func main() {`` ` `    ``// Finding the reverse order of a``    ``// Using ReverseBytes64() function``    ``a1 := bits.ReverseBytes64(3)``    ``fmt.Printf(``"ReverseBytes64(%064b) := %b\n"``, 3, a1)`` ` `    ``a2 := bits.ReverseBytes64(9)``    ``fmt.Printf(``"ReverseBytes64(%064b) := %b\n"``, 9, a2)`` ` `}`

Output:

ReverseBytes64(0000000000000000000000000000000000000000000000000000000000000011) := 1100000000000000000000000000000000000000000000000000000000
ReverseBytes64(0000000000000000000000000000000000000000000000000000000000001001) := 100100000000000000000000000000000000000000000000000000000000

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