Kotlin Loops

FAQ

Q. Why we use loops?
A. Loops are used when we need to do a task repeatedly till a condition satisfies.

Q. What is the use of continue?
A. Whenever we encounter a continue in a loop, all the lines of code below it are skipped and then it jumps back to the top.

Q. What is the use of break?
A. break is used to terminate a loop if a certain condition is encountered.

Q. What is the difference between while and do while loop?
A. while loop checks the condition first and then keeps executing till the condition is satisfied,
   whereas do while executes first and then checks the condition that means that it will run at least once.

MCQ

Q. Which one is a correct condition declaration to traverse an array arr?
a) for(i in arr) {---loop body---}
b) for(i in arr.indices) {---loop body---}
c) for((i,j) in arr.withIndex()) {---loop body---}
d) all of these

A. d) all of these

Q. What will be the output?
   fun main() {
        for (i in 1..10) {
            if (i % 2 == 0){
                continue
            }
            print("$i, ")

            if (i >= 4) {
                break
            }
        }
    }
a) 1, 3, 
b) 1, 3, 5, 
c) 1, 3, 5, 7, 9, 
d) None of These

A. b) 1, 3, 5, 

Q. What will be the output?
    fun main() {
    var arr = arrayOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
        for ((i, j) in arr.withIndex()) {
            if (j == 3) continue
            if (i == 5) break
            
            print("$i, ")
        }
    }
a) 0, 1, 3, 4, 
b) 0, 1, 2, 4, 
c) 0, 1, 3, 4, 5, 
d) 0, 1, 2, 4, 5, 

A. a) 0, 1, 3, 4, 

Q. What will be the output?
   fun main(){
       for(i in 1..2) {
           print("loop range : $i-- ")
       }
   }
a) 1 2 
b) 0 1 
c) 1-- 2-- 

A. c) 1-- 2--