Question

How to implement the power function in Go

Answer 1

package main

import (
    "fmt"
)

func myPow(base float64, exponent int) float64 {
    result := 1.0

    for exponent > 0 {
        if exponent&1 == 1 {
            result *= base
        }
        exponent >>= 1
        base *= base
    }

    return result
}

func main() {
    fmt.Println(myPow(2, 3))  // 8
    fmt.Println(myPow(3, 3))  // 27
    fmt.Println(myPow(3, 2))  // 9
    fmt.Println(myPow(2, 2))  // 4
    fmt.Println(myPow(5.0, 2))  // 25
    fmt.Println(myPow(-2, 4)) // 16
}



/*
run:

8
27
9
4
25
16

*/

 

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