Question

How to get the fraction and exponent of a real number in Kotlin

Answer 1

import kotlin.math.floor
import kotlin.math.log2
import kotlin.math.pow
import kotlin.math.abs

fun frexp(value: Double): Pair<Double, Int> {
    if (value == 0.0) return Pair(0.0, 0)

    val exponent = floor(log2(abs(value))).toInt() + 1
    val fraction = value / 2.0.pow(exponent)
    
    return Pair(fraction, exponent)
}

fun main() {
    val d = 3.14
    
    val (fraction, exponent) = frexp(d)
    
    println("fraction = %.3f exponent = %d".format(fraction, exponent))
}

 
  
/*
run:
  
fraction = 0.785 exponent = 2

*/

 

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