Read String Data Input in Kotlin

Definition

In Kotlin, readLine() reads a line of input from the standard input stream or screen.

Syntax

var variable_name = readLine()

// Kotlin Defintion
fun readLine(): String? (source)

Read String in Kotlin Example Program

// Read String in Kotlin example program
// Data Input Kotlin Programs, Basic Kotlin Programs

fun main(args: Array < String > ) {
    
    println("Pleas enter the Name")

    var name = readLine()!!
    println("Name is : $name")
}

Sample Output

Pleas enter the Name
GOODMAN
Name is :GOODMAN

How It Works

Here is a step-by-step walkthrough of how the Kotlin program for Read String Data Input in Kotlin runs, line by line. Following the flow of the code makes it clear how each statement contributes to the final result:

1. fun main(args: Array < String > ) { — defines a function used by the program.
2. println("Pleas enter the Name") — writes a line of output shown in the sample output.
3. var name = readLine()!! — reads a value entered by the user.
4. println("Name is : $name") — writes a line of output shown in the sample output.

Key points to remember:

• Read the code top to bottom and match each line to the output it produces.
• Compile and run the example yourself rather than only reading it.
• Modify one statement at a time so you can see exactly what each change does.

After running it, compare your console output with the Sample Output above to confirm the program behaves as expected. Try changing the values and re-running the program to see how the result changes — experimenting with small edits is the fastest way to understand the logic and to remember the Kotlin syntax used in this example.