Integer and Float number types in Ruby - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Ruby code with integer division?

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

Ruby

result = 7 / 2
puts result

A 3

B 3.5

C 4

D 7

💡 Hint

In Ruby, dividing two integers with `/` returns an integer if both are integers.

In Ruby, dividing two integers with `/` performs integer division, so 7 / 2 equals 3, discarding the remainder.

❓ Predict Output

intermediate

What is the output when dividing an integer by a float?

Look at this Ruby code. What will it print?

Ruby

result = 7 / 2.0
puts result

A 3.5

B 3

C 3.0

D 2.5

💡 Hint

When one number is a float, Ruby returns a float result.

Since 2.0 is a float, Ruby performs floating-point division, so 7 / 2.0 equals 3.5.

🧠 Conceptual

advanced

What error does this Ruby code raise?

What error will this Ruby code produce when run?

Ruby

num = 5.0
num = num.to_i + "3"

A ZeroDivisionError

B NoMethodError

C SyntaxError

D TypeError

💡 Hint

Adding an integer and a string directly causes a type problem.

You cannot add an integer and a string directly in Ruby; this causes a TypeError.

❓ Predict Output

advanced

What is the output of this Ruby code mixing floats and integers?

What will this Ruby code print?

Ruby

a = 10
b = 3
c = a / b.to_f
puts c.class
puts c

A

Integer
3

B

Float
3.3333333333333335

C

Float
3

D

Integer
3.3333333333333335

💡 Hint

Converting one operand to float changes the division result type.

b.to_f converts b to float, so a / b.to_f returns a float. The class is Float and value is 3.3333333333333335.

❓ Predict Output

expert

What is the output of this Ruby code using Float precision?

Examine this Ruby code. What will it print?

Ruby

x = 0.1 + 0.2
puts x == 0.3
puts x

A

false
0.3

B

true
0.3

C

false
0.30000000000000004

D

true
0.30000000000000004

💡 Hint

Floating point numbers can have small precision errors.

Due to floating point precision, 0.1 + 0.2 is not exactly 0.3, so the equality is false and the value prints as 0.30000000000000004.