Python Problem 1: Calculate the Area of a Circle

Problem Statement:

Write a Python function called calculate_circle_area that takes the radius of a circle as input and returns the area of the circle. The area of a circle is calculated using the formula:

Area=π r^2

where:

- π (pi) is approximately 3.14159

- r is the radius of the circle.

Requirements:

1. The function should take a single argument radius (a float or integer).

2. Return the calculated area as a float.

3. Handle edge cases (e.g., negative radius) by returning None.

Example:

print(calculate_circle_area(5))   # Output: 78.53975 (because 3.14159 * 5^2 = 78.53975)

print(calculate_circle_area(-3))  # Output: None (because radius cannot be negative)

---

Solution Code:

import math

def calculate_circle_area(radius):

    if radius < 0:

        return None

    area = math.pi  (radius * 2)

    return area

# Alternatively, without using the math module:

# def calculate_circle_area(radius):

#     if radius < 0:

#         return None

#     pi = 3.14159

#     area = pi  (radius * 2)

#     return area

# Test cases

print(calculate_circle_area(5))   # Output: 78.53981633974483 (math.pi is more precise)

print(calculate_circle_area(-3))  # Output: None

```

Explanation:

1. The function checks if the radius is negative. If so, it returns None.

2. If the radius is valid, it calculates the area using \( \pi \times r^2 \).

3. Using math.pi provides a more precise value of pi, but you could also use an approximate value like 3.14159.

4. The test cases demonstrate the function's correctness for both valid and invalid inputs.

Would you like a different or more challenging problem and learn python? 😊

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