Kotlin Conditionals

FAQ

Q. What is when?
A. When works as switch cases.

Q. What is the use of conditional operators?
A. These are used to check some conditions and if they satisfy then only our code block will work.

Q. Can we use a range in when for comparision?
A. Yes, we can use range by using the in keyword.

Q. What if no condition of when is satisfied?
A. In that case if you have a default case using else than that will execute otherwise the when would not execute.

MCQ

Q. What will be the output of this code?
    fun main() {
        var a = 10
        var b = 10.0
        println(a == b)
    }
a) true
b) false
c) compilation error
d) 10 == 10.0

A. c) compilation error // == can't be applied between different types.

Q. What will be the output?
    fun main(){
    var a = -1
        if(a < 0) {
            println(a--)
        } else {
            println(a++)
        }
    }
a) -2
b) 0
c) -1

A. c) -1

Q. What will be the output?
    fun main() {
        var a = 5.0
        when(a) {
            5 -> println("a = $a")
            else -> println("Hello")
        }
    }
a) a = 5.0
b) Hello
c) a = $a
d) compilation error

A. d) compilation error // Incompatible types

Q. What is the output?
    fun main() {
        val a = 1
        if(a < 4 && a > 5) {
            println("a = $a")
        }
    }
a) a = 1
b) a = $a
c) compilation error
d) no output

A. d) no output