Hi there I want to write a program in kotlin that receives a string from user and prints last two elements of that string twice

Question

val scan = Scanner(System.in)

println("Enter word: ")
var word = scan.next()

var a = word.length-1
var b = word.length-2

//var str = word.substring(b, a)
var str = word.length
word.get(b++)
word.get(a++)

print(word.get(b))
print(word.get(a))

Answer 1

In Kotlin in is a keyword and needs to be put in backtics for variables with that name. so you could replace

val scan = Scanner(System.in)

with

val scan = Scanner(System.`in`)

However, there's actually no need to make a scanner. Kotlin has the build in function readln to read the input.

furthermore, these line don't do anything useful

word.get(b++)
word.get(a++)

and it actually will bring a outside the range of the word.

also it looks nicer to write word[a] instead of word.get(a). They do exactly the same

It's also recommended to use val instead of var if you're not changing the value aftwards

So I believe this is what you would like:

println("Enter word: ")
val word = readln()

val a = word.length-1
val b = word.length-2

print(word[b])
print(word[a])

print(word[b])
print(word[a])