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Swift - scalbn() Function



The Swift scalbn() function returns the result of multiplying the significand (x) by FLT_RADIX raised to the power of the exponent (n). On most platforms, FLT_RADIX is 2. Mathematically, it can be expressed as:

scalbn(x,n) = x * FLT_RADIXn

Syntax

In Foundation framework, it is defined as follows:

public func scalbn(_ __x: Double, _ __n: Int32) -> Double

Parameters

x Specify the value representing the significand.
n Specify the value of the exponent.

Return Value

Returns x * FLT_RADIXn.

Example:

The example below shows the usage of scalbn() function.

import Foundation

print("scalbn(0.8, 2) = \(scalbn(0.8, 2))")
print("scalbn(5, 2) = \(scalbn(5, 2))")
print("scalbn(2.0, 3) = \(scalbn(2.0, 3))")
print("scalbn(3.0, 4) = \(scalbn(3.0, 4))")

The output of the above code will be:

scalbn(0.8, 2) = 3.2
scalbn(5, 2) = 20.0
scalbn(2.0, 3) = 16.0
scalbn(3.0, 4) = 48.0

❮ Swift Math Functions

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