Mathematical functions in Swift

Question

How do I use mathematical functions like sqrt(), floor(), round(), sin(), etc?

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When doing:

_ = floor(2.0) _ = sqrt(2.0) 

I get:

error: use of unresolved identifier 'floor'
error: use of unresolved identifier 'sqrt'

Answer 1

As other noted you have several options. If you want only mathematical functions. You can import only Darwin.

import Darwin 

If you want mathematical functions and other standard classes and functions. You can import Foundation.

import Foundation 

If you want everything and also classes for user interface, it depends if your playground is for OS X or iOS.

For OS X, you need import Cocoa.

import Cocoa 

For iOS, you need import UIKit.

import UIKit 

You can easily discover your playground platform by opening File Inspector (⌥⌘1).

Answer 2

To be perfectly precise, Darwin is enough. No need to import the whole Cocoa framework.

import Darwin 

Of course, if you need elements from Cocoa or Foundation or other higher level frameworks, you can import them instead