readln

reads a single line of text from the console

```
let name = readln("what's your name ? ")
println("your name is " + name)

let a = readln("Value of a : ")
let b = readln("Value of b : ")

if a:equals("") { a = 0 } else { a = Integer.parseInt(a) }
if b:equals("") { b = 0 } else { b = Integer.parseInt(b) }

println("a+b = " + a + b)
```