Procedural vs object-oriented approach in Python - Practice Questions

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of procedural code for area calculation

What is the output of this procedural Python code that calculates the area of a rectangle?

Python

def area(length, width):
    return length * width

result = area(5, 3)
print(result)

A TypeError

B 8

C 53

D 15

💡 Hint

Multiply length by width to get the area.

The function multiplies 5 by 3, resulting in 15.

❓ Predict Output

intermediate

Output of object-oriented code for area calculation

What is the output of this object-oriented Python code that calculates the area of a rectangle?

Python

class Rectangle:
    def __init__(self, length, width):
        self.length = length
        self.width = width
    def area(self):
        return self.length * self.width

rect = Rectangle(5, 3)
print(rect.area())

A 15

B TypeError

C 8

D None

💡 Hint

The method area multiplies length and width stored in the object.

The Rectangle object stores 5 and 3, and area() returns 15.

🧠 Conceptual

advanced

Difference in data handling between procedural and OOP

Which statement best describes how data is handled differently in procedural vs object-oriented programming?

A Procedural programming groups data and functions together; OOP separates them.

B Procedural programming uses objects to store data; OOP uses global variables.

C OOP groups data and functions together inside objects; procedural programming keeps them separate.

D OOP does not use functions; procedural programming only uses functions.

💡 Hint

Think about where data and behavior live in each approach.

OOP bundles data and related functions inside objects, while procedural programming keeps data and functions separate.

❓ Predict Output

advanced

Output of mixed procedural and OOP code

What is the output of this code mixing procedural and object-oriented styles?

Python

class Counter:
    def __init__(self):
        self.count = 0
    def increment(self):
        self.count += 1

def increment_counter(counter):
    counter.increment()
    return counter.count

c = Counter()
print(increment_counter(c))
print(c.count)

A TypeError

B

1
1

C

0
1

D

1
0

💡 Hint

The function calls the object's method to increase count.

increment_counter calls increment(), increasing count to 1, then returns 1. The object's count is also 1.

🧠 Conceptual

expert

Advantages of object-oriented approach over procedural

Which of the following is the main advantage of using object-oriented programming over procedural programming?

A It allows bundling data and behavior, making code easier to manage and reuse.

B It requires fewer lines of code for all programs.

C It always runs faster than procedural code.

D It eliminates the need for functions.

💡 Hint

Think about how OOP helps organize code.

OOP bundles data and related functions inside objects, improving code organization and reuse.