Fam4k

🔰 Project Overview

A calculator is one of the simplest yet most effective projects to start with in Python.
You will learn:

• Taking user input.
• Using functions for organization.
• Handling basic operations (addition, subtraction, multiplication, division).
• Using conditionals to control the logic.

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✍️ Step 1: Plan the Calculator

We need:

1. A menu for users to choose an operation.
2. Functions for each operation.
3. A loop to keep the calculator running until the user decides to quit.

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🖥️ Step 2: Write the Code

# Basic Calculator in Python

# Define operations
def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

def multiply(a, b):
    return a * b

def divide(a, b):
    if b != 0:
        return a / b
    else:
        return "Error! Division by zero."

# Main program loop
while True:
    print("\n📌 Simple Calculator")
    print("1. Addition (+)")
    print("2. Subtraction (-)")
    print("3. Multiplication (*)")
    print("4. Division (/)")
    print("5. Exit")

    choice = input("👉 Choose an operation (1-5): ")

    if choice == "5":
        print("✅ Exiting the calculator. Goodbye!")
        break

    if choice in ["1", "2", "3", "4"]:
        num1 = float(input("Enter first number: "))
        num2 = float(input("Enter second number: "))

        if choice == "1":
            print("Result:", add(num1, num2))
        elif choice == "2":
            print("Result:", subtract(num1, num2))
        elif choice == "3":
            print("Result:", multiply(num1, num2))
        elif choice == "4":
            print("Result:", divide(num1, num2))
    else:
        print("⚠️ Invalid choice, please try again.")

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🎯 Sample Output

📌 Simple Calculator
1. Addition (+)
2. Subtraction (-)
3. Multiplication (*)
4. Division (/)
5. Exit
👉 Choose an operation (1-5): 1
Enter first number: 10
Enter second number: 5
Result: 15.0

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📊 Operation Summary Table

Operation	Function Used	Example Input	Example Output
Addition	add(a, b)	10 + 5	15.0
Subtraction	subtract(a,b)	10 – 5	5.0
Multiplication	multiply(a,b)	10 * 5	50.0
Division	divide(a,b)	10 / 5	2.0
Division by 0	divide(a,b)	10 / 0	Error message

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🧠 Exercise for You

• Add a power function (exponentiation).
• Add a modulus function (remainder).
• Improve the calculator by allowing the user to enter the operation as a symbol (+, -, *, /) instead of numbers.

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📝 Summary

• You learned how to build a basic calculator using Python.
• You practiced functions, loops, conditionals, and input handling.
• This project is the foundation for building more advanced tools like a scientific calculator.

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