If and if-else statements in Swift - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of nested if-else statements

What is the output of this Swift code?

Swift

let number = 15
if number % 3 == 0 {
    if number % 5 == 0 {
        print("FizzBuzz")
    } else {
        print("Fizz")
    }
} else {
    print("No match")
}

A FizzBuzz

B Fizz

C Buzz

D No match

💡 Hint

Check if the number is divisible by 3 and then by 5 inside the nested if.

The number 15 is divisible by 3 (15 % 3 == 0), so the outer if is true. Inside, 15 % 5 == 0 is also true, so it prints "FizzBuzz".

❓ Predict Output

intermediate

Output of if-else with multiple conditions

What will be printed by this Swift code?

Swift

let score = 75
if score >= 90 {
    print("Grade A")
} else if score >= 80 {
    print("Grade B")
} else if score >= 70 {
    print("Grade C")
} else {
    print("Grade F")
}

A Grade A

B Grade C

C Grade B

D Grade F

💡 Hint

Check the conditions from top to bottom and see where 75 fits.

The score 75 is less than 90 and 80 but greater or equal to 70, so it prints "Grade C".

🔧 Debug

advanced

Identify the error in if-else syntax

What error does this Swift code produce?

Swift

let temperature = 30
if temperature > 25
    print("Hot day")
else
    print("Cool day")

A TypeError: Cannot compare Int with Int

B RuntimeError: Unexpected token

C No error, prints "Hot day"

D SyntaxError: Missing braces for if and else blocks

💡 Hint

Swift requires braces {} for if and else blocks.

In Swift, if and else blocks must be enclosed in braces {}. Missing braces cause a syntax error.

🧠 Conceptual

advanced

Understanding if-else statement flow

Consider this Swift code snippet: let x = 10 if x > 5 { print("A") } else if x > 8 { print("B") } else { print("C") } What will be printed?

A B

B C

C A

D No output

💡 Hint

The first true condition stops the rest from running.

The first condition x > 5 is true (10 > 5), so it prints "A" and skips the rest.

❓ Predict Output

expert

Output of complex if-else with logical operators

What is the output of this Swift code?

Swift

let a = 4
let b = 7
if a > 5 && b < 10 {
    print("X")
} else if a <= 5 || b > 10 {
    print("Y")
} else {
    print("Z")
}

A Y

B No output

C Z

D X

💡 Hint

Evaluate each condition carefully with logical AND and OR.

a > 5 is false (4 > 5 is false), so first if is false. Second condition a <= 5 is true (4 <= 5), so second if is true and prints "Y".