Golang Program to find the position of the rightmost set bit

Examples

Consider n = 20(00010100)

Now return log₂(20 & -20) => 2+1 => 3

Approach to solve this problem

Step 1 − Define a method, where n and is an argument, return type is int.

Step 2 − Return log2(n & -n)+1.

Example

package main
import (
   "fmt"
   "math"
   "strconv"
)
func FindRightMostSetBit(n int) int {
   if (n & 1) != 0{
      return 1
   }
   return int(math.Log2(float64(n & -n))) + 1
}
func main(){
   var n = 20
   fmt.Printf("Binary of %d is: %s.\n", n, strconv.FormatInt(int64(n), 2))
   fmt.Printf("Position of the rightmost set bit of the given number %d is %d.\n", n, FindRightMostSetBit(n))
}

Output

Binary of 20 is: 10100.
Position of the rightmost set bit of the given number 20 is 3.

Rishikesh Kumar Rishi

Published on 17-Mar-2021 11:08:16