Semicolons are optional behavior in Swift - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Swift code with semicolons?

Consider this Swift code snippet where semicolons are used at the end of each statement. What will be printed when this code runs?

Swift

let a = 5;
let b = 10;
print(a + b);

A 15

B 510

C Syntax Error

D 5 + 10

💡 Hint

Semicolons separate statements but do not change how expressions are evaluated.

Semicolons in Swift are optional and only separate statements. The code adds 5 and 10, printing 15.

❓ Predict Output

intermediate

What happens if you omit semicolons in Swift?

Look at this Swift code without semicolons. What will be the output?

Swift

let x = 3
let y = 7
print(x * y)

A 37

B 21

C Syntax Error

D x * y

💡 Hint

Swift allows omitting semicolons if statements are on separate lines.

Swift does not require semicolons if each statement is on its own line. The code multiplies 3 by 7 and prints 21.

❓ Predict Output

advanced

What is the output of this Swift code with multiple statements on one line?

This Swift code puts two statements on the same line separated by a semicolon. What will it print?

Swift

let name = "Swift"; print("Hello, \(name)!")

A Hello, Swift!

B Hello, name!

C Syntax Error

D Hello, \(name)!

💡 Hint

Semicolons allow multiple statements on one line.

The semicolon separates two statements on the same line. The print statement uses string interpolation to print Hello, Swift!

❓ Predict Output

advanced

What error does this Swift code produce without semicolons on the same line?

What error will this Swift code cause when run?

Swift

let a = 1 let b = 2
print(a + b)

A Runtime Error

B 3

C Syntax Error: Expected ';' after expression

D No output

💡 Hint

Swift requires semicolons to separate multiple statements on the same line.

When two statements are on the same line without a semicolon, Swift raises a syntax error expecting a semicolon.

🧠 Conceptual

expert

How do semicolons affect Swift code readability and style?

Which statement best describes the role of semicolons in Swift code style and readability?

A Semicolons are deprecated and cause warnings if used.

B Semicolons must be used only in loops and conditionals for clarity.

C Semicolons are mandatory and improve readability by clearly ending statements.

D Semicolons are optional and usually omitted to keep code clean and readable.

💡 Hint

Think about common Swift style guides and how code is usually written.

Swift allows semicolons but style guides recommend omitting them to keep code clean and easy to read.