Question

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

Answer 1

import Foundation

func frexp(_ value: Double) -> (Double, Int) {
    guard value != 0 else { return (0.0, 0) }

    let exponent = Int(floor(log2(abs(value)))) + 1
    let fraction = value / pow(2.0, Double(exponent))
    
    return (fraction, exponent)
}

let d = 3.14

let (fraction, exponent) = frexp(d)

print(String(format: "fraction = %.3f exponent = %d", fraction, exponent))



/*
run:

fraction = 0.785 exponent = 2

*/

 

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