To find the greatest common divisor (GCD) of two numbers in Swift, we can use the Euclidean algorithm.

`main.swift150 chars9 lines`

Here, we define a recursive function `gcd`

that takes two integers `a`

and `b`

as parameters. We first find the remainder of `a`

divided by `b`

using the modulo operator `%`

. If the remainder is zero, then the GCD is `b`

, and we return it. Otherwise, we recursively call the `gcd`

function with `b`

and the remainder as the new parameters. This continues until we reach a point where the remainder is zero and we can return the GCD.

We can call the `gcd`

function with two numbers like this:

`main.swift122 chars5 lines`

This will output `GCD of 24 and 36 is 12`

, which is the correct answer.

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