Swift - log2() Function
The Swift log2() function returns the base-2 logarithm of a given number.
Syntax
In Foundation framework, it is defined as follows:
public func log2(_ x: CGFloat) -> CGFloat public func log2(_ x: Float) -> Float public func log2(_ x: Float80) -> Float80 public func log2(_ __x: Double) -> Double
Parameters
x |
Specify the number. |
Return Value
Returns the base-2 logarithm of a given number.
If the x is negative, it returns -nan.
If the x is 0, it returns -inf.
Example:
In the example below, log2() function is used to calculate the base-2 logarithm of a given number.
import Foundation
print("log2(0.0) = \(log2(0.0))")
print("log2(1.0) = \(log2(1.0))")
print("log2(2.0) = \(log2(2.0))")
print("log2(50.0) = \(log2(50.0))")
print("log2(-1.0) = \(log2(-1.0))")
The output of the above code will be:
log2(0.0) = -inf log2(1.0) = 0.0 log2(2.0) = 1.0 log2(50.0) = 5.643856189774724 log2(-1.0) = -nan
❮ Swift Math Functions
