81. You have written a snippet of code to display the results of the roll of a six-sided die. When the die displays from 3 to 6 inclusive, you want to display a special message. Using a Kotlin range, what code should you add?
when (die) {
1 -> println("die is 1")
2 -> println("die is 2")
___ -> printlin("die is between 3 and 6")
else -> printlin("dies is unknown")
}
when (die) {
1 -> println("die is 1")
2 -> println("die is 2")
___ -> printlin("die is between 3 and 6")
else -> printlin("dies is unknown")
}82. Why does not this code snippet compile?
class Cat (name: String) {
fun greet() { println("Hello ${this.name}") }
}
fun main() {
val thunderCat = Cat("ThunderCat")
thunderCat.greet()
}
class Cat (name: String) {
fun greet() { println("Hello ${this.name}") }
}
fun main() {
val thunderCat = Cat("ThunderCat")
thunderCat.greet()
}83. What is the output of the following code?
fun main() {
val num = 15
when (num) {
10 -> println("Ten")
15 -> println("Fifteen")
20 -> println("Twenty")
else -> println("Other")
}
}
fun main() {
val num = 15
when (num) {
10 -> println("Ten")
15 -> println("Fifteen")
20 -> println("Twenty")
else -> println("Other")
}
}84. What is the output of the following code?
fun main() {
val list = listOf(1, 2, 3, 4, 5)
for (num in list) {
println(num)
}
}
fun main() {
val list = listOf(1, 2, 3, 4, 5)
for (num in list) {
println(num)
}
}85. Why doesn't this code compile?
val addend = 1
infix fun Int.add(added: Int=1) = this + addend
fun main(){
val msg = "Hello"
println( msg shouldMatch "Hello")
println( 10 multiply 5 + 2)
println( 10 add 5)
}
val addend = 1
infix fun Int.add(added: Int=1) = this + addend
fun main(){
val msg = "Hello"
println( msg shouldMatch "Hello")
println( 10 multiply 5 + 2)
println( 10 add 5)
}86. You have started a long-running coroutine whose job you have assigned to a variable named task. If the need arose, how could you abort the coroutine?
val task = launch {
// long running job
}
val task = launch {
// long running job
}87. In order to subclass the Person class, what is one thing you must do?
abstract class Person(val name: String) {
abstract fun displayJob(description: String)
}
abstract class Person(val name: String) {
abstract fun displayJob(description: String)
}88. What is to in the example below:
val test = 33 to 42
val test = 33 to 4289. You have a function simple() that is called frequently in your code. You place the inline prefix on the function. What effect does it have on the code?
inline fun simple(x: Int): Int{
return x * x
}
fun main() {
for(count in 1..1000) {
simple(count)
}
}
inline fun simple(x: Int): Int{
return x * x
}
fun main() {
for(count in 1..1000) {
simple(count)
}
}90. This code snippet compiles without error, but never prints the results when executed. What could be wrong?
Val result = generateSequence(1) { it + 1 }.toList(); Println(result)
Val result = generateSequence(1) { it + 1 }.toList(); Println(result)Read More Section(Kotlin Program)
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