Introduction to Programming in Kotlin INTRODUCTION

PRACTICE QUIZ: VARIABLES, VALUES AND TYPES

1. In the following code, if the variable str never changes its value, what should fill the gap marked as ___?

fun main() { 
___ str = "ABC" 
println(str) 
} 

2. In the following code, if the variable str changes value within the function, what should fill the gap marked as ___?

fun main() { 
___ str = "ABC" 
str = "XYZ" 
println(str) 
} 

3. What value type is “Hello, World”?

4. What is the data type of the value true?

5.What is the data type of the value 10.0?

6. Which of the following is of the type ‘Any’? Select all that apply.

7. Which of the following operations can be done on the var variable of type String? Select all that apply.

var str = "ABC"

8. Which of the following operations can be done on line 2 of the following code?

val i = 123
//Code here

9. You want to represent the weight of a customer. Which value type will you use?

10. Is this code incorrect?  

var a = "A"​
a = 5

11. True or False
Kotlin is a high-level programming language. This means that it must be converted to binary code before a CPU can work with it.     

PRACTICE QUIZ: SELF-REVIEW: PRACTICE USING MATH OPERATIONS IN KOTLIN

1. What is the output of the following code?

fun main() {
println(50+2*3) 
}

2. What is the output of the following code?    

println(150+2+100*2) 

3. What is the output of the following code?

fun main() {
println(150+(2+100)*2)
}   

4. What is the result of the following:

fun main() {
    val x = 5  
    val y = 3  
    val z = 8  
    println(x+y*z)
}

5. You want to store a decimal number such as 3.14. Which of the following number types is used to declare the variable in the code below?

1   val pi = 3.14

PRACTICE QUIZ: KNOWLEDGE CHECK: STRING

1. What is the result of the following code?

fun main() { 
val num = 10 
println("Result is $num") 
} 

2. What is the result of the following code?

fun main() { 
val num = 10 + 20 
println("Result is $num") 
} 

3. What is the result of the following code?

fun main() { 
    val num = 10 
    println("Result is ${num + 20}") 
} 

4. What is the result of the following code?

fun main() { 
val num = 10 
println("Result is $num + 20") 
} 

5. What is the result of the code below? 

fun main() { 
val s = "Hello world"
println(s[0])
}

6. You would like to inline a single variable value into a string value. Which one of the following do you use?

PRACTICE QUIZ: KNOWLEDGE CHECK: BOOLEAN VALUES AND LOGICAL OPERATIONS

1. What is the result of the following code? 

fun main() { 
print(11 > 10) 
print(11 <= 10) 
print(10 >= 11) 
print(10 < 11) 
} 

2. What is the result of the following code?

fun main() { 
print(10 > 10) 
print(10 >= 10) 
print(10 <= 10) 
} 

3. What is the result of the following code?

fun main() { 
print("A" == "A") 
print("A" == "B") 
print("A" == "AB") 
} 

4. What is the result of the following code?

fun main() { 
print(true && true) 
print(true && false) 
print(false && true) 
print(false && false) 
} 

5. What is the result of the following code?

fun main() { 
print(true || true) 
print(true || false) 
print(false || true) 
print(false || false) 
} 

6. What is the result of the following code?

fun main() { 
print(true) 
print(!true) 
print(!!true) 
print(!!!true) 
} 

7. What is the result of the following code?

fun main() { 
val finishedHomework = true 
val cleanedRoom = true 
val passedMathExam = false 
val canPlayGames = finishedHomework && cleanedRoom 
val canEatSweets = finishedHomework && passedMathExam 
print(canPlayGames) 
print(canEatSweets) 
} 

PRACTICE QUIZ: KNOWLEDGE CHECK: CONDITIONAL STATEMENTS

1. What is the result of the below code?

fun main() {
val hour = 9
val userName = "Alex"


if (hour <= 10) {
print("Good morning, ")
} else if (hour >= 20) {
print("Good evening, ")
} else {
print("Hello, ")
}


if (userName == "admin") {
println("what would you like to do?")
} else {
println("how can I help you, $userName?")
}
}

2. What is the result of the below code?

fun main() {
val hour = 11
val userName = "admin"
if (hour <= 10) {
print("Good morning, ")
} else if (hour >= 20) {
print("Good evening, ")
} else {
print("Hello, ")
}


if (userName == "admin") {
println("what would you like to do?")
} else {
println("how can I help you, $userName?")
}
}

3. What is the result of the below code?

fun main() {
val password = "ABC"
val error = if (password.length < 7) "Password is too short." else "Password is ok."
print(error)
}

4. Yes or No: The If statement is used to specify a block of code to be executed if a condition is true.    

5. The output of the code below is Good evening.

fun main() {
val time = 20
val greeting =
if (time < 18) {
"Good day."
} else {
"Good evening."
}
println(greeting)
}

6. Every bodyline in Kotlin starts with four additional spaces called ‘formatting’.      

PRACTICE QUIZ: KNOWLEDGE CHECK: WHEN CONDITIONAL STATEMENT

1. What is the result of the below code?

fun main() {
val value = 0


when {
value > 0 -> println("Positive")
value < 0 -> println("Negative")
else -> println("Other")
}
}

2. What is the result of the below code?

fun main() {


val dogType = "Border Collie"


val expectedWeight =
when (dogType) {
"Labrador Retriever" -> "25 - 36"
"Fox Terrier" -> "7 - 8"
"Border Collie" -> "12 - 20"
"Foxhound" -> "31 - 32"
else -> "(unknown)"
}


println("The weight of $dogType should be $expectedWeight kg")
}

3. What is the result of the below code?

fun main() {
val name = "Rex"
val age = 3



val status =
when (age) {
1 -> "puppy"
in 2..10 -> "dog"
else -> "older dog"
}


println("$name is $status")
}

4. What is missing in the place of ___ ?

val number = 123
 
val text =
when {
number > 0 -> "Positive"
number < 0 -> "Negative"
____ -> "Zero"
}

5. What is the output of the code below?

fun main() {
val i = 16
when {
i > 0 -> print("Number is positive.")
i == 0 -> print("Number is zero.")
i < 0 -> print("Number is negative.")
}
}

6. You want to create a “when” conditional statement for the costs of items on your website. You then add a parenthesis with a value directly after the “when” keyword and then branches for possible values instead of conditions. Is this correct?

PRACTICE QUIZ: SELF-REVIEW: PRACTICE USING CONDITIONS

1. The code below will compile.

if(a = 10) {
print("Welcome to if")
} else {
print("Welcome to else")
}

2. What is the output of the following code when a = 21  

if (a < 20)
if(a > 10) 
print("Hi $a")
else if(a < 10) 
print ("Bonjour $a")
else 
print ("Welcome $a")

3. Which statement is used to check if Little Lemon is currently open or closed? 

PRACTICE QUIZ: KNOWLEDGE CHECK: WHILE STATEMENT

1. What are the differences between the if condition and the while loop? Select all that apply.

2. What will be printed by the below code?

fun main() {
var toBePrinted = true
while (toBePrinted) {
print("A")
toBePrinted = false
}
}

3. What sequence of numbers will be printed by the following code?

fun main() {
var i = 12
while (i < 100) {
print("$i ")
i = i + 13
}
}

4. What sequence of numbers will be printed by the following code?

fun main() {
var i = 8
while (i < 100) {
println("$i ")
i = i * 3
}
}

5. True or False: The while loop loops through a block of code as long as a specified condition is false.

6. What is the output of the code below?

fun  main{
var i = 0
while (i < 5) {
println(i)
i++
}
}

7. The while loop can be thought of as repeating if statements.

PRACTICE QUIZ: KNOWLEDGE CHECK: LOOPS

1. What is missing in the following code if it needs to print 12345?   

fun main() {
for (i __ 1..5) {
print(i)        
}
}

2. What is missing in this code, if it needs to print 1234?

fun main() {
 
for (i in 1__5) {
 
print(i)
}
}

3. What is missing in the below code, if it needs to print 54321?

fun main() {
 
for (i in 5__1) {
 
print(i)
}
}

4. What is the result of the following code?    

fun main() {
 
for (i in 1..4) {
 
for (j in 1..i) {
 
print("*")
}
println()
}
}

5. What is the output of the code below? 

fun main() {
for (i in 1..5) 
print(i) 
}

6. A for loop iterates through anything that contains a countable number of values.

7. You need to print a square of stars of size five by five. Which one of the following is responsible for printing the row?

PRACTICE QUIZ: SELF REVIEW: PRACTICE CREATING LOOPS

1. In Task 1 of the exercise, you were prompted to make a note of the code output. Which for in creates each line in the output of Task 1?  

2. Which code snippet allows you to determine the number of stars per line for Task 1?  

3. In Task 2 of the exercise, you were prompted to make a note of the code output. Check the pattern created by Task 2. How many for in loops were used to achieve the triangle shape output?

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QUIZ: MODULE QUIZ: INTRODUCTION TO PROGRAMMING IN KOTLIN

1. What is the result of the below code?

fun main() {
val value = true
println("$value || false")
}

2. What is the result of the below code?

fun main() {
    println(true && false) 
    println (true || false)
}

3. What is the result of the below code?

fun main() { val dogType = "Foxhound"
val expectedWeight =
when (dogType) {
"Labrador Retriever" -> "25 - 36"
"Fox Terrier" -> "7 - 8"
"Border Collie" -> "12 - 20"
"Foxhound" -> "31 - 32"
else -> "(unknown)"
}


println("The weight of $dogType should be $expectedWeight kg")
}

4. What is the output of the code below?

fun main() {
val i = 1
if (i > 8) {
println("Michael")
} else {
println("Tonia")
}
}

5. What will happen to the while statement in the code below?

fun main() {
while (true) {
println("Hello world!")
}
}

6. What is the output of the code below?    

fun main() {
val i = 1
if (i < 3) {
println("Smaller")
} else {
println("Bigger")
}
}

7. The data type of the variable c in the code below is                                          

val c = 40.0

8.  The data type of the variable b in the code below is                                               

val b = 15L

9. The Int data type is used to store ___________________numbers.     

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