Print and println output in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "Hello, Kotlin!" on the same line.

Kotlin

print([1])

Drag options to blanks, or click blank then click option'

A"Hello, Kotlin!"

Bprintln("Hello, Kotlin!")

Cprint("Hello, Kotlin!\n")

Decho "Hello, Kotlin!"

Attempts:

3 left

💡 Hint

Common Mistakes

Using println instead of print when the task asks for same line output.

Forgetting to put the text inside quotes.

The print function outputs text without adding a new line.

2fill in blank

medium

Complete the code to print "Hello, Kotlin!" and move to the next line.

Kotlin

println([1])

Drag options to blanks, or click blank then click option'

A'Hello, Kotlin!'

BHello, Kotlin!

C"Hello, Kotlin!"

Dprintln("Hello, Kotlin!")

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the text.

Using single quotes which are for characters, not strings.

The println function prints the text and then moves to the next line. Text must be inside double quotes.

3fill in blank

hard

Fix the error in the code to print "Kotlin is fun!" on a new line.

Kotlin

println([1])

Drag options to blanks, or click blank then click option'

AKotlin is fun!

B"Kotlin is fun!"

C'Kotlin is fun!'

Dprintln("Kotlin is fun!")

Attempts:

3 left

💡 Hint

Common Mistakes

Using text without quotes causing syntax error.

Using single quotes which are for single characters.

Text must be inside double quotes to be a valid string in Kotlin.

4fill in blank

hard

Fill both blanks to print numbers 1 to 3 on the same line separated by spaces.

Kotlin

print(1 + [1] + 2 + [2] + 3)

Drag options to blanks, or click blank then click option'

A" "

B,

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using commas which are not valid operators here.

Using + without spaces causing numbers to join without spaces.

Adding a space string between numbers concatenates them with spaces.

5fill in blank

hard

Fill all three blanks to print "Sum: 15" on a new line using variables.

Kotlin

val a = 7
val b = 8
println([1] + ([2] + [3]))

Drag options to blanks, or click blank then click option'

A"Sum: "

Ba

Cb

D"15"

Attempts:

3 left

💡 Hint

Common Mistakes

Putting variables before the string causing wrong output.

Using the string "15" instead of adding variables.

Concatenate the string "Sum: " with variables a and b to print the sum.

Practice

1. What is the main difference between print and println in Kotlin?

easy

A. print outputs only numbers; println outputs only text.

B. print adds a newline after output; println outputs text without a newline.

C. print outputs text without a newline; println adds a newline after output.

D. print is used for debugging; println is used for user messages.

Solution

1. Step 1: Understand print behavior

   print outputs text exactly as given and stays on the same line.

2. Step 2: Understand println behavior

   println outputs text and then moves the cursor to the next line.

3. Final Answer:

   print outputs text without a newline; println adds a newline after output. -> Option C

4. Quick Check:

   print no newline, println newline = A [OK]

Hint: Remember: println adds a line break, print does not [OK]

Common Mistakes:

• Confusing which function adds a newline
• Thinking print adds a newline
• Assuming println outputs only numbers

2. Which of the following is the correct syntax to print "Hello" and then move to a new line in Kotlin?

easy

A. println("Hello")

B. print("Hello")

C. println Hello

D. println["Hello"]

Solution

1. Step 1: Check syntax correctness

   Only println("Hello") uses correct function call syntax with parentheses and quotes.

2. Step 2: Verify output behavior

   println("Hello") prints "Hello" and moves to a new line automatically.

3. Final Answer:

   println("Hello") -> Option A

4. Quick Check:

   Correct syntax with println = A [OK]

Hint: Use parentheses and quotes exactly for print/println [OK]

Common Mistakes:

• Missing parentheses around arguments
• Using square brackets instead of parentheses
• Omitting quotes around strings

3. What will be the output of the following Kotlin code?

print("Hi")
println(" there")
print("Welcome")

medium

A. Hi there
Welcome

B. Hi
there
Welcome

C. Hi there Welcome

D. Hi there
Welcome

Solution

1. Step 1: Trace first print statement

   print("Hi") outputs "Hi" without newline.

2. Step 2: Trace println statement

   println(" there") outputs " there" and moves to next line.

3. Step 3: Trace last print statement

   print("Welcome") outputs "Welcome" on the new line.

4. Final Answer:

   Hi there Welcome -> Option D

5. Quick Check:

   print no newline, println newline = D [OK]

Hint: Remember print stays on line; println moves to next line [OK]

Common Mistakes:

• Assuming print adds newline
• Ignoring space in " there"
• Thinking all output is on one line

4. Identify the error in this Kotlin code snippet:

print("Hello")
println "World"

medium

A. Missing parentheses in println call

B. Missing quotes around Hello

C. print cannot be used without println

D. No error, code runs fine

Solution

1. Step 1: Check syntax of print statement

   print("Hello") is correct with parentheses and quotes.

2. Step 2: Check syntax of println statement

   println "World" is missing parentheses around the argument, which is required in Kotlin.

3. Final Answer:

   Missing parentheses in println call -> Option A

4. Quick Check:

   Function calls need parentheses = B [OK]

Hint: Always use parentheses for function calls in Kotlin [OK]

Common Mistakes:

• Omitting parentheses in function calls
• Thinking print needs println to work
• Confusing quotes usage

5. You want to print the numbers 1, 2, and 3 on the same line separated by spaces, then print "Done" on the next line. Which Kotlin code achieves this?

hard

A. print("1 2 3")
print("Done")

B. print("1 2 3")
println("Done")

C. print("1 ")
print("2 ")
print("3\n")
println("Done")

D. println("1")
println("2")
println("3")
print("Done")

Solution

1. Step 1: Print numbers on same line with spaces

   Using print("1 2 3") outputs "1 2 3" on the same line.

2. Step 2: Print "Done" on next line

   println("Done") prints "Done" and moves to the next line.

3. Final Answer:

   print("1 2 3") println("Done") -> Option B

4. Quick Check:

   Use print for same line, println for new line = A [OK]

Hint: Use print for same line, println to move to next line [OK]

Common Mistakes:

• Using println for each number causing new lines
• Using print after println without newline
• Adding \n inside print incorrectly