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(1, "zebra") < (2, "apple")   // true because 1 is less than 2; "zebra" and "apple" are not compared
(3, "apple") < (3, "bird")    // true because 3 is equal to 3, and "apple" is less than "bird"
(4, "dog") == (4, "dog")      // true because 4 is equal to 4, and "dog" is equal to "dog”

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var x = 0.0, y = 0.0, z = 0.0

var red, green, blue: Double

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import xml.etree.ElementTree as ET
import requests
root = ET.fromstring(requests.get('http://podcasts.apple.com/stanford/developing_ios11_apps.xml').text)
for enclosure in root.findall('.//enclosure'):
    print(enclosure.get('url'))

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class Shape {
    var numberOfSides = 0
    func simpleDescription() -> String {
        return "A shape with \(numberOfSides) sides."
    }
}

var shape = Shape()
shape.numberOfSides = 7
var shapeDescription = shape.simpleDescription()

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print("Hello, world!")