find the natural logarithm of a number in swift

To find the natural logarithm of a number in Swift, we can use the log() function from the Foundation framework. The log() function takes two arguments: the number to take the logarithm of, and the base of the logarithm. To find the natural logarithm, we use the constant M_E as the base, which represents Euler's number.

Here's an example of finding the natural logarithm of a number in Swift:

main.swift
import Foundation

let x = 10.0
let lnX = log(x)

print(lnX) // Output: 2.302585092994046
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In this example, we first import the Foundation framework, which provides the log() function. We then define a constant x with the value we want to take the natural logarithm of. We call the log() function with x as the first argument, and M_E as the second argument (since we want the natural logarithm). The result is stored in a constant lnX. Finally, we print out the result.