Question

How to implement the power function in Scala

Answer 1

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

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

    result
  }

  def main(args: Array[String]): Unit = {
    println(myPow(2, 3))  // 8
    println(myPow(3, 3))  // 27
    println(myPow(3, 2))  // 9
    println(myPow(2, 2))  // 4
    println(myPow(5, 2))  // 25
    println(myPow(-2, 4)) // 16
  }
}


 
/*
run:

8.0
27.0
9.0
4.0
25.0
16.0

*/

 

70+ SQL courses for beginners and professionals