readln - input What is the difference between operasi zebra readLine and readlnOrNull readln Common JS JVM Native WasmJS WasmWASI expect fun readln String Reads a line of input from the standard input stream and returns it or throws a RuntimeException if EOF has already been reached when readln is called LF or CRLF is treated as the line terminator Line terminator is not included in the returned string Basically the kotlin devs wanted readLine to return a nonnull String now instead of String but changing it now isnt backwards compatibleSo they added a new function readln instead and deprecated readLine These conversion functions assume the user enters a valid representation of the target data type For example converting hello to an integer using toInt would result in an exception as the function expects a number in the string input To read several input elements separated by a delimiter use the split function specifying the delimiter The following code sample reads from the Smart Pascal ReadLn command GitHub Pages procedure ReadLn Args Arguments Description Read reads one or more values from a file F and stores the result in V1 V2 etc After that it goes to the next line in the file The end of the line is marked by any of the supported line ending styles independent of the platform on which the code is running supported line ending styles are The readln function automatically converts the input to the String type Your program can handle string number and boolean input using type conversion To convert use the functions toInt toLong toDouble and toBoolean You can also input and output multiple values of the same or different types Lets Deep Dive into readln and Type Conversion in Kotlin Description The ReadLn procedure reads a complete line of data from a text file or to the console Version 1 Is used to read from lernen the console Version 2 Is used to read a line of text from a text file with the given FileHandle You must use AssignFile to assign a file to the FileHandle and open the file with Reset before using ReadLn The current file text line is parsed into the given We must note that readln and readlnOrNull are only available in Kotlin 160 and above If were using an older version in the project then we can use the readLine function val inputText readLine Interestingly this isnt a synonym for ScannerreadLine like print is for Systemoutprint Noob Question What is the difference between readln and readLine Type Conversion with readln By default the readln function reads everything as a String However many programs require numeric inputs such as age prices or counts Luckily Kotlin provides easytouse conversion methods like toInt toLong toDouble and toBoolean to handle this Lets explore how these conversions work Console IO in Kotlin Baeldung on Kotlin Reading data with readln Hyperskill They added readlnOrNull as an alias of readLine for the sake of preserving the convention that each standard library function that throws a RuntimeException has an orNull version that returns null instead of throwing It was added when readlnwas addedIts so the matching function with this behavior can be easily found If readln had existed from the earliest version of Kotlin then Standard input Kotlin Documentation readln Kotlin Programming Language Standard input Java Scanner is a slow tool Use it only when you need the specific functionalities it offers Otherwise its generally preferable to use Kotlins readln function to read standard input To read from the standard input Java provides the Scanner class Kotlin offers two main ways to read from the standard input the Scanner class similar to Java and the readln function ReadLn Free Pascal Read standard input Kotlin anggau Documentation Kotlin Programming Language
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