1.区间的定义

fun main(args: Array<String>) {
    //三种定义方式
    val range1 = 1..100
    val range2 = IntRange(1, 100)
    val range3 = 1.rangeTo(100)
    /*-------长整型区间----------------*/
    val range4 = 1L..100L
    val range5 = LongRange(1L, 100L)
    val ramge6 = 1L.rangeTo(100L)
    /*-------字符区间----------------*/
    val range7 = 'a'..'z'
    val range8 = CharRange('a', 'z')
    val range9 = 'a'.rangeTo('z')
}

2.反向区间的定义

fun main(args: Array<String>) {
    val  range=100 downTo 1
    range.forEach{
        println(it)
    }
    /*-------区间反转----------------*/
    val reversed = range.reversed()
    reversed.forEach{
        println(it)
    }
     //指定步长
    for (value in reversed step 2){
        println(value)
    }
}

3.区间的遍历

fun main(args: Array<String>) {
    //三种定义方式
    val range1 = 1..100
    val range2 = IntRange(1, 100)
    val range3 = 1.rangeTo(100)
    /*-------长整型区间----------------*/
    val range4 = 1L..100L
    val range5 = LongRange(1L, 100L)
    val ramge6 = 1L.rangeTo(100L)
    /*-------字符区间----------------*/
    val range7 = 'a'..'z'
    val range8 = CharRange('a', 'z')
    val range9 = 'a'.rangeTo('z')

    for (index in range1) {
        println(index)
    }

    for ((index, value) in range4.withIndex()) {
        "index=$index    value=$value"
    }

    range7.forEach {
        println(it)
    }
}