Question

How to round a number to the previous power of 2 in Go

Answer 1

package main

import (
    "fmt"
    "math"
)

// roundToPreviousPowerOf2 returns the previous power of 2 less than or equal to n.
func roundToPreviousPowerOf2(n int) int {
    if n <= 0 {
        return 0
    }
    return int(math.Pow(2, math.Floor(math.Log2(float64(n)))))
}

func main() {
    num := 21
    
    fmt.Printf("Previous power of 2: %d\n", roundToPreviousPowerOf2(num))
}




/*
run:
 
Previous power of 2: 16
 
*/

 

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