Swift - Making Choices(Bool, if/else, Comparisons)

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) 7.をSwiftで考えてみる。

5.6(Exercises) 7.

コード(Xcode)

main.swift

//
//  main.swift
//  sample7
//
//  Created by kamimura on 8/1/14.
//  Copyright (c) 2014 kamimura. All rights reserved.
//

import Foundation

for population:Float in [9000000, 10000000, 35000000, 40000000] {
    for land_area:Float in [80000, 90000, 340000, 300000] {
        println("population = \(Int(population)), land_area = \(Int(land_area))")
        println("1.")
        if population < 10000000 {
            println(Int(population))
        }
        println("2.")
        if population >= 10000000 && population <= 35000000 {
            println(Int(population))
        }
        println("3.")
        if population / land_area > 100 {
            println("Densely populated")
        }
        println("4.")
        if population / land_area > 100 {
            println("Densely population")
        } else {
            println("Sparsely population")
        }
    }
}

入出力結果(Console Output)

population = 9000000, land_area = 80000
1.
9000000
2.
3.
Densely populated
4.
Densely population
population = 9000000, land_area = 90000
1.
9000000
2.
3.
4.
Sparsely population
population = 9000000, land_area = 340000
1.
9000000
2.
3.
4.
Sparsely population
population = 9000000, land_area = 300000
1.
9000000
2.
3.
4.
Sparsely population
population = 10000000, land_area = 80000
1.
2.
10000000
3.
Densely populated
4.
Densely population
population = 10000000, land_area = 90000
1.
2.
10000000
3.
Densely populated
4.
Densely population
population = 10000000, land_area = 340000
1.
2.
10000000
3.
4.
Sparsely population
population = 10000000, land_area = 300000
1.
2.
10000000
3.
4.
Sparsely population
population = 35000000, land_area = 80000
1.
2.
35000000
3.
Densely populated
4.
Densely population
population = 35000000, land_area = 90000
1.
2.
35000000
3.
Densely populated
4.
Densely population
population = 35000000, land_area = 340000
1.
2.
35000000
3.
Densely populated
4.
Densely population
population = 35000000, land_area = 300000
1.
2.
35000000
3.
Densely populated
4.
Densely population
population = 40000000, land_area = 80000
1.
2.
3.
Densely populated
4.
Densely population
population = 40000000, land_area = 90000
1.
2.
3.
Densely populated
4.
Densely population
population = 40000000, land_area = 340000
1.
2.
3.
Densely populated
4.
Densely population
population = 40000000, land_area = 300000
1.
2.
3.
Densely populated
4.
Densely population
Program ended with exit code: 0