Kotlin:游程长度编码 [英] Kotlin: Run length encoding

问题描述

程序正常运行，但是，我仍然遇到逻辑错误: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.

The program works, however, I still get a logical error: the final letter doesn't run through. For example, when I enter aaaabbbbccccdddd the output I get is a4b4c4 but there is no 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

        }


    }


}

推荐答案

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

strUser contains chars by indexes from 0 to iLength - 1 so you have to write for (i in 0 until iLength) instead of for (i in 0..iLength)

但是Tenfour04是完全正确的，您可以不带索引地迭代 strUser :

But Tenfour04 is completely right, you can just iterate strUser without indexes:

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
        }
    }
}

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