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## activebits
### Instructions
Write a function, `ActiveBits`, that returns the number of active `bits` (bits with the value 1) in the binary representation of an integer number.
### Expected function
```go
func ActiveBits(n int) int {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
6 years ago
"fmt"
piscine ".."
)
func main() {
nbits := piscine.ActiveBits(7)
fmt.Println(nbits)
}
```
And its output :
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
3
student@ubuntu:~/[[ROOT]]/test$
```