arrays - 如何在Kotlin上实现readLine()!!。toIntArray()？

Question

我想实现一个功能或从控制台顺序存储数组的某种方式。像这样:readLine()!!.toIntArray()

Would it be convenient to use a loop for this or could it be avoided?

然后，您可以使用数组的索引访问它们。

fun main(args: Array<String>) {
    myFunction()
}

答:

fun myFunction() {
    println(" . First number: ")
    val num1:Float = readLine()!!.toFloat()
    println(" . Second number: ")
    val num2:Float = readLine()!!.toFloat()
    println(" . Third number: ")
    val num3:Float = readLine()!!.toFloat()
    println(" . Fourth number: ")
    val num4:Float = readLine()!!.toFloat()

    val result:Float = (num1+num2) + (num3*num4)
    print("The result is: $result")
}

B:

fun myFunction() {
    println("Enter four numbers ...")
//    val numbers:IntArray = intArrayOf(45, 22, 10, 13)
    val numbers:IntArray = readLine()!!.toIntArray()   //HERE: toIntArray() isn't defined

    val result:Int = (numbers[0]+numbers[1]) + (numbers[2]*numbers[3])
    print("The result is: $result")
}

定义数组时，我必须指出要从控制台读取的值的数量，即数组的大小。

Or is there another way to stop reading data in the console?

简而言之，我想从A块转向B块。

解

println("Enter four numbers ...")
val numbers = readLine()!!.split(" ").map { it.toInt() }

val result:Int = (numbers[0]+numbers[1]) + (numbers[2]*numbers[3])
print("The result is: $result")

Answer 1

您不需要循环。可以用map完成:

val numbers = readLine()!!.split(" ").map { it.toInt() }