Question

How to implement the power function in Kotlin

Answer 1

fun myPow(base: Double, exponent: Int): Double {
    var result = 1.0
    var baseVar = base
    var expVar = exponent

    while (expVar > 0) {
        if ((expVar and 1) == 1) {
            result *= baseVar
        }
        expVar = expVar shr 1
        baseVar *= baseVar
    }

    return result
}

fun main() {
    println(myPow(2.0, 3))  // 8
    println(myPow(3.0, 3))  // 27
    println(myPow(3.0, 2))  // 9
    println(myPow(2.0, 2))  // 4
    println(myPow(5.0, 2))  // 25
    println(myPow(-2.0, 4)) // 16
}

 
  
/*
run:
  
8.0
27.0
9.0
4.0
25.0
16.0

*/

 

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