Kotlin：游程编码

Question

该程序有效，但是，我仍然遇到一个逻辑错误：最后一个字母没有通过。例如，当我输入aaaabbbbccccdddd时，我得到的输出是a4b4c4，但没有d4。

fun main () {

    val strUser = readLine()!!.toLowerCase()
    val iLength = strUser!!.length
    var iMatch : Int = 0
    var chrMatch : Char = strUser[0]

    for (i in 0..iLength) {

        if (strUser[i] == chrMatch) {

            iMatch += 1
        }else {
            print("$chrMatch$iMatch")
            chrMatch = strUser[i]
            iMatch = 1

        }


    }


}

Answer 1

fun main（）{

val strUser = readLine()!!.toLowerCase()
var iMatch : Int = 0
var chrMatch : Char = strUser[0]

for (char in strUser+1) {

    if (char == chrMatch) {

        iMatch += 1
    }else {
        print("$chrMatch$iMatch")
        chrMatch = char
        iMatch = 1

    }


}

}

Answer 2

[strUser包含按从0到iLength - 1的索引的字符，因此您必须写for (i in 0 until iLength)而不是for (i in 0..iLength)

但是Tenfour04完全正确，您可以不带索引就迭代strUser：

fun main() {
    val strUser = readLine()!!.toLowerCase()
    var iMatch: Int = 0
    var chrMatch: Char = strUser[0]

    for (char in strUser) {
        if (char == chrMatch) {
            iMatch += 1
        } else {
            print("$chrMatch$iMatch")
            chrMatch = char
            iMatch = 1
        }
    }
}