開発環境
- macOS Mojave - Apple (OS)
- Windows 10 Pro (OS)
- IntelliJ IDEA CE(Community Edition) (IDE(統合開発環境))
- Kotlin (プログラミング言語)
Head First Kotlin: A Brain-Friendly Guide (Dawn Griffiths(著)、David Griffiths(著)、O'Reilly Media)のChapter 3(functions - Getting Out of Main)、Mixed Messages(79)の解答を求めてみる。
コード
fun main() { var x = 0 var y = 20 for(outer in 1..3) { for (inner in 4 downTo 2) { x += 6 y++ x += 3 } y -= 2 } println("${x == 81}, ${y == 23}") x = 0 y = 20 for (outer in 1..3) { for (inner in 4 downTo 2) { x-- y++ x += 3 } y -= 2 } println("${x == 18}, ${y == 23}") x = 0 y = 20 for (outer in 1..3) { for (inner in 4 downTo 2) { y = x + y y++ x += 3 } y -= 2 } println("${x == 27}, ${y == 131}") x = 0 y = 20 for (outer in 1..3) { for (inner in 4 downTo 2) { y = 7 y++ x += 3 } y -= 2 } println("${x == 27}, ${y == 6}") x = 0 y = 20 for (outer in 1..3) { for (inner in 4 downTo 2) { x = x + y y = x - 7 y++ x += 3 // outer=1 // inner=4: x=23, y=14 // inner=3: x=40, y=31 // inner=2: x=74, y=65 // inner=1: x=142, y=133 // outer=2 // inner=4: x=276, y=267 } y -= 2 // outer=1: x=142, y=131 } // y - x = 11 println("${x == 4286}, ${y == 4275}") x = 0 y = 20 for (outer in 1..3) { for (inner in 4 downTo 2) { x = y y++ y++ x += 3 } y -= 2 } // x - y = 3 println("${x == 35}, ${y == 32}") }
入出力結果
true, true true, true true, true true, true true, true true, true Process finished with exit code 0
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