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bits.Len64() Function in Golang with Examples
• Last Updated : 19 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 Len64() function which is used to find the minimum number of bits required to represent a and the result is 0 for a == 0. To access Len64() function you need to add a math/bits package in your program with the help of the import keyword.

Syntax:

`func Len64(a uint64) (n int)`

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

Return Value: This function returns the minimum number of bits required to represent a.

Example 1:

 `// Golang program to illustrate bits.Len64() Function``package main`` ` `import (``    ``"fmt"``    ``"math/bits"``)`` ` `// Main function``func main() {`` ` `    ``// Using Len64() function``    ``a := bits.Len64(1)``    ``fmt.Printf(``"The minimum number of bits"``+``      ``" required to represent %d: %d"``, 1, a)`` ` `}`

Output:

`The minimum number of bits required to represent 1: 1`

Example 2 :

 `// Golang program to illustrate bits.Len64() Function``package main`` ` `import (``    ``"fmt"``    ``"math/bits"``)`` ` `// Main function``func main() {`` ` `    ``// Using Len64() function``    ``a1 := bits.Len64(5)``    ``fmt.Printf(``"Len64(%064b) = %d\n"``, 5, a1)`` ` `    ``a2 := bits.Len64(12)``    ``fmt.Printf(``"Len64(%064b) = %d\n"``, 12, a2)`` ` `}`

Output:

```Len64(0000000000000000000000000000000000000000000000000000000000000101) = 3
Len64(0000000000000000000000000000000000000000000000000000000000001100) = 4
```

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