If, elsif, else statements in Ruby - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Ruby code with if, elsif, else?

Consider the following Ruby code snippet. What will it print when run?

Ruby

score = 75
if score >= 90
  puts "Excellent"
elsif score >= 60
  puts "Good"
else
  puts "Needs Improvement"
end

A No output

B Excellent

C Good

D Needs Improvement

💡 Hint

Think about which condition matches the score 75 first.

The score 75 is not >= 90, so the first if is false. The elsif checks if score >= 60, which is true, so it prints "Good".

❓ Predict Output

intermediate

What does this Ruby code print?

Look at this Ruby code using if, elsif, and else. What will be printed?

Ruby

temperature = 30
if temperature > 35
  puts "It's very hot"
elsif temperature > 25
  puts "It's warm"
elsif temperature > 15
  puts "It's cool"
else
  puts "It's cold"
end

A It's very hot

B It's warm

C It's cool

D It's cold

💡 Hint

Check the first condition that matches temperature 30.

30 is not > 35, so first if is false. 30 > 25 is true, so it prints "It's warm" and skips the rest.

🔧 Debug

advanced

Why does this Ruby code raise an error?

This Ruby code is intended to print a message based on age, but it raises an error. What is the cause?

Ruby

age = 20
if age < 13
  puts "Child"
elsif age < 20
  puts "Teenager"
else
  puts "Adult"
end

A Missing 'end' keyword to close the if statement

B Using 'elsif' instead of 'else if' causes syntax error

C The variable 'age' is not defined

D The comparison operators are invalid

💡 Hint

Check if all blocks are properly closed.

Ruby requires every if block to be closed with 'end'. This code is missing the final 'end', causing a syntax error.

🧠 Conceptual

advanced

What is the value of 'result' after this Ruby code runs?

Analyze the code and determine the final value of the variable 'result'.

Ruby

number = 10
result = if number > 10
  "Greater"
elsif number == 10
  "Equal"
else
  "Smaller"
end

A "Greater"

B nil

C "Smaller"

D "Equal"

💡 Hint

Remember that if-elsif-else in Ruby returns the last evaluated expression.

Since number == 10, the elsif condition is true, so result is assigned "Equal".

📝 Syntax

expert

Which option causes a syntax error in Ruby if-elsif-else statement?

Identify which code snippet will cause a syntax error when run.

A

if x > 0
  puts "Positive"
elsif x == 0
  puts "Zero"
else
  puts "Negative"

B

if x > 0
  puts "Positive"
elsif x == 0
  puts "Zero"
else
  puts "Negative"
end

C

dne
"evitageN" stup  
esle
"oreZ" stup  
0 == x fisle
"evitisoP" stup  
0 > x fi

D

f x > 0
  puts "Positive"
elsif x == 0
  puts "Zero"
else
  puts "Negative"
end

💡 Hint

Check if all if statements are properly closed.

Option A is missing the 'end' keyword to close the if statement, causing a syntax error.