How to do it...

Let's go through the following steps by which we can read console input in Kotlin:

1. We will start simple and move to more advanced logic as we move forward. First, let's start with simply printing a line as output in the console:

println("Just a line")

1. Now we will try to take String input from the console and output it again:

println("Input your first name")
var first_name = readLine()
println("Your first name: $first_name")

1. Okay, how about we repeat the process with Int:

println("Hi $first_name, let us have a quick math test. Enter two numbers separated by space.")
val (a, b) = readLine()!!.split(' ').map(String::toInt)
println("$a + $b = ${a+b}")

1. Now, let's try a complicated code and then start with the explanations:

fun main(args: Array<String>) {
   println("Input your first name")
   var first_name = readLine()
   println("Input your last name")
   var last_name = readLine()
   println("Hi $first_name $last_name, let us have a quick math test. Enter two numbers separated by space.")
   val (a, b) = readLine()!!.split(' ').map(String::toInt)
  println("what is $a + $b ?")
  println("Your answer is ${if (readLine()!!.toInt() == (a+b)) "correct" else "incorrect"}")
   println("Correct answer = ${a+b}")
 println("what is $a * $b ?")
   println("Your answer is ${if (readLine()!!.toInt() == (a*b)) "correct" else "incorrect"}")
   println("Correct answer = ${a*b}")
   println("Thanks for participating :)")
}

Here's a screenshot of compiling and running the preceding code: