Print function for output in Swift - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Swift print statement?

Look at the code below. What will it print when run?

Swift

print("Hello, \"Swift\" world!")

A Hello, 'Swift' world!

B Hello, "Swift" world!

C Hello, Swift world!

D Hello, \"Swift\" world!

💡 Hint

Remember how escape characters work in strings.

The backslash \ is used to escape the double quotes inside the string, so they appear as part of the output.

❓ Predict Output

intermediate

What does this Swift code print?

Check the code and choose the correct output.

Swift

let name = "Anna"
print("Hello, \(name)!")

A Hello, Anna!

B Hello, \(name)!

C Hello, name!

D Hello, (name)!

💡 Hint

Look at how Swift uses \(variable) inside strings.

Swift replaces \(name) with the value of the variable name, which is "Anna".

❓ Predict Output

advanced

What is the output of this Swift code with multiple print statements?

Analyze the code and select the correct output sequence.

Swift

print("Line 1")
print("Line 2", terminator: " ")
print("Line 3")

A

Line 1
Line 2 Line 3

B

Line 1 Line 2 Line 3

C

Line 1
Line 2
Line 3

D

Line 1 Line 2
Line 3

💡 Hint

Check how the terminator parameter changes the print behavior.

The second print uses terminator: " " which means it ends with a space instead of a new line, so Line 3 prints on the same line after a space.

❓ Predict Output

advanced

What will this Swift code print?

Consider the code and pick the correct output.

Swift

let number = 5
print("Number is \(number * 2)")

A Number is 5 * 2

B Number is number * 2

C Number is 10

D Number is \(number * 2)

💡 Hint

Swift evaluates expressions inside \( ) in strings.

The expression number * 2 is calculated to 10 and printed inside the string.

❓ Predict Output

expert

What is the output of this Swift code using multiline string and print?

Look carefully at the code and select the exact output.

Swift

let poem = """
Roses are red,
Violets are blue,
Swift is fun,
And so are you.
"""
print(poem)

A Roses are red,\nViolets are blue,\nSwift is fun,\nAnd so are you.

B Roses are red, Violets are blue, Swift is fun, And so are you.

C "Roses are red,\nViolets are blue,\nSwift is fun,\nAnd so are you."

D

Roses are red,
Violets are blue,
Swift is fun,
And so are you.

💡 Hint

Multiline strings keep line breaks as they are.

The multiline string preserves the line breaks and prints exactly as written.

Practice

1.

What does the print function do in Swift?

easy

A. It shows text or values on the screen.

B. It saves data to a file.

C. It creates a new variable.

D. It deletes a program.

Solution

1. Step 1: Understand the purpose of print

   The print function is used to display output on the screen, such as text or variable values.

2. Step 2: Compare options with print's function

   Only It shows text or values on the screen. describes showing text or values on the screen, which matches print's purpose.

3. Final Answer:

   It shows text or values on the screen. -> Option A

4. Quick Check:

   print function = display output [OK]

Hint: Remember: print means show on screen [OK]

Common Mistakes:

• Thinking print saves data
• Confusing print with variable creation
• Assuming print deletes data

2.

Which of the following is the correct way to print the text Hello, Swift! in Swift?

?

easy

A. echo "Hello, Swift!"

B. println('Hello, Swift!')

C. print("Hello, Swift!")

D. print Hello, Swift!

Solution

1. Step 1: Identify correct Swift print syntax

   Swift uses print() with double quotes for strings.

2. Step 2: Check each option

   print("Hello, Swift!") uses print("Hello, Swift!"), which is correct. Others use wrong functions or missing parentheses/quotes.

3. Final Answer:

   print("Hello, Swift!") -> Option C

4. Quick Check:

   Correct print syntax = print("Hello, Swift!") [OK]

Hint: Use print() with double quotes for text [OK]

Common Mistakes:

• Using single quotes for strings
• Missing parentheses
• Using wrong function names

3.

What will be the output of this Swift code?

let name = "Anna"
print("Hello, \(name)!")

medium

A. Error: Invalid syntax

B. Hello, \(name)!

C. Hello, name!

D. Hello, Anna!

Solution

1. Step 1: Understand string interpolation

   The syntax \(name) inserts the value of variable name into the string.

2. Step 2: Substitute variable value

   Since name is "Anna", the printed string becomes "Hello, Anna!".

3. Final Answer:

   Hello, Anna! -> Option D

4. Quick Check:

   String interpolation = Hello, Anna! [OK]

Hint: Use \(variable) to insert values in strings [OK]

Common Mistakes:

• Printing variable name literally
• Forgetting \( ) syntax
• Syntax errors in string interpolation

4.

Find the error in this Swift code snippet:

let age = 25
print("Age is: " + age)

medium

A. Missing parentheses in print.

B. Cannot add String and Int directly.

C. Variable age is not declared.

D. print function is misspelled.

Solution

1. Step 1: Analyze the print statement

   The code tries to add a String and an Int using +, which is not allowed in Swift.

2. Step 2: Identify correct way to combine String and Int

   Use string interpolation like "Age is: \(age)" instead of + operator.

3. Final Answer:

   Cannot add String and Int directly. -> Option B

4. Quick Check:

   String + Int needs interpolation [OK]

Hint: Use \(variable) to combine text and numbers [OK]

Common Mistakes:

• Trying to add String and Int
• Missing string interpolation
• Assuming + works for different types

5.

You want to print a list of numbers from 1 to 3 on the same line separated by spaces using Swift. Which code will do this correctly?

?

hard

A. print(1, 2, 3, separator: " ")

B. print("1, 2, 3")

C. print(1 + " " + 2 + " " + 3)

D. print(1, 2, 3, sep: " ")

Solution

1. Step 1: Understand print's separator parameter

   Swift's print can take multiple values and a separator argument to join them with a string.

2. Step 2: Check each option

   print(1, 2, 3, separator: " ") uses separator: " " correctly to print "1 2 3". Adding numbers and strings causes type error, print("1, 2, 3") prints commas instead of spaces, wrong parameter name fails.

3. Final Answer:

   print(1, 2, 3, separator: " ") -> Option A

4. Quick Check:

   Use separator: " " to join values [OK]

Hint: Use separator: " " to print values with spaces [OK]

Common Mistakes:

• Using wrong parameter name sep
• Trying to add Int and String
• Printing fixed string instead of variables