🚀 Day 16/150 – Find Square of a Number in Python

Finding the square of a number is one of the most basic yet important operations in programming. It helps build a strong foundation for mathematical computations, algorithms, and problem-solving.

In this blog, we’ll explore multiple ways to calculate the square of a number in Python, along with simple explanations so you truly understand what’s happening behind the scenes.

---

Method 1 – Using Multiplication Operator

This is the most straightforward way.

num = 5 square = num * num print("Square of the number:", square)

✅ Explanation:

• num * num simply multiplies the number by itself.
• If num = 5, then 5 * 5 = 25.

👉 Best for beginners because it’s clear and easy to understand.

Method 2 – Using Exponent Operator **

Python provides a special operator for powers.

num = 5
square = num ** 2

print("Square:", square)

✅ Explanation:

• ** means “power of”
• num ** 2 means num raised to the power of 2

👉 Cleaner and more “Pythonic” than multiplication.

Method 3 – Taking User Input

Make your program interactive.

num = int(input("Enter a number: ")) square = num ** 2 print("Square of the number:", square)

✅ Explanation:

• input() takes input as a string → converted to integer using int()
• Then we calculate the square

👉 Useful when building real applications.

Method 4 – Using a Function

Functions help in code reuse and better structure.

def find_square(n): return n * n print(find_square(5))

✅ Explanation:

• def defines a function
• return sends the result back
• You can reuse find_square() anywhere

👉 Best practice for clean and modular code.

Method 5 – Using Lambda Function

A short and quick way to write functions.

square = lambda x: x * x print(square(5))

✅ Explanation:

• lambda creates an anonymous (one-line) function
• x * x computes the square

👉 Useful for small, quick operations.

✅ Explanation:

• lambda creates an anonymous (one-line) function
• x * x computes the square

👉 Useful for small, quick operations.

---

⚡ Key Takeaways

• ✔ Use num * num for clarity
• ✔ Use num ** 2 for cleaner syntax
• ✔ Use functions for reusable code
• ✔ Use lambda for quick one-liners
• ✔ Always validate input in real-world programs