Swift - logb() Function
The Swift logb() function returns the logarithm of |x| (mod of argument), using FLT_RADIX as base for the logarithm. On most platforms, FLT_RADIX is 2.
Syntax
In Foundation framework, it is defined as follows:
public func logb(_ x: CGFloat) -> CGFloat public func logb(_ x: Float) -> Float public func logb(_ x: Float80) -> Float80 public func logb(_ __x: Double) -> Double
Parameters
x |
Specify the value to calculate logarithm. |
Return Value
Returns the base-FLT_RADIX logarithm of |x|.
Example:
In the example below, logb() function is used to calculate the base-FLT_RADIX logarithm of absolute value of given numbers.
import Foundation
print("logb(0.0) = \(logb(0.0))")
print("logb(1.0) = \(logb(1.0))")
print("logb(10.0) = \(logb(10.0))")
print("logb(50.0) = \(logb(50.0))")
print("logb(-10.0) = \(logb(-10.0))")
The output of the above code will be:
logb(0.0) = -inf logb(1.0) = 0.0 logb(10.0) = 3.0 logb(50.0) = 5.0 logb(-10.0) = 3.0
❮ Swift Math Functions
