Swift - Making Choices(Function, absolute value, Boolean expression)

The Swift Programming Language
Apple Inc.

開発環境

• OS X Mavericks - Apple(OS)
• Xcode 6.0 Beta
• Swift (プログラミング言語)

Practical Programming: An Introduction to Computer Science Using Python 3 (Pragmatic Programmers) (Paul Gries (著)、Jennifer Campbell (著)、Jason Montojo (著)、Lynn Beighley (編集)、Pragmatic Bookshelf)のChapter 5(Making Choices)、5.6(Exercises) 5.をSwiftで考えてみる。

5.6(Exercises) 5.

コード(Xcode)

section-1.swift

// Playground - noun: a place where people can play

func f(num:Int) -> Bool {
    var result: Bool = num == abs(num)
    return result
}

for n in -5...5 {
    println("\(n): \(f(n))")
}

入出力結果(Console Output, Assistant Editor)

-5: false
-4: false
-3: false
-2: false
-1: false
0: true
1: true
2: true
3: true
4: true
5: true