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val charRange = 'a' .. 'z' //包含a到z
val intRange = 1 until 10 //1到9，不包含10
val stepRange = 1 .. 10 step 2

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val range1 = 1 .. 10
var c = 10
println(c in range1) //true
c = 11
println(c !in range1)

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val range1 = 1 until 10
var c = 10
println(c in range1)
println(c !in range1)

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2
    val range = 2 .. 7
    println(range.contains(5))

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val range = 2 .. 7
println(range)          // 輸出: 2..7
println(range.first)    // 輸出: 2
println(range.last)     // 輸出: 7
println(range.step)     // 輸出: 1

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// in關鍵字會將變數i的值限制在指定範圍內
for (i in 0 .. 6) {
    // i在每次徝環時取得一個+1的值
    println(i)
}

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for (c in 'a' .. 'e') {
    // c在每次徝環時取得一個+1的值
    println(c)
}

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3
for (i in 0 until 6) {
    println(i)
}

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for (i in 6 downTo 0) {
    // i在每次徝環時取得一個-1的值
    println(i)
}

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3
for (i in 0..6 step 2) {
    println(i)
}

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// Range作為變數
val range = 0 .. 10
var a = 1
//如果a 在 range中就返回true，否則返回false
while (a in range) {
    a++
    println("$a")
}

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val range = 2 .. 7
// 轉成list
val list = range.toList()
// 轉成陣列
val arr = (2 .. 7).toList().toIntArray()
// set沒有重覆的值
val set = range.toSet()