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.swift90 chars7 lines`

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.

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