In losangels , a young coder named Lucifer set out on a mission to build his very own calculator. Along the way, he learned how to use Git, a powerful tool that would help him track his progress and manage his code. Here’s the complete story of how Lucifer built his calculator, step by step, with the power of Git.

Step 1: Setting Up the Project with git init

Lucifer started by creating a new directory for his project and initializing a Git repository. This was like setting up a magical vault to store all his coding adventures.

mkdir MagicCalculator
cd MagicCalculator
git init

This command created the .git directory inside the MagicCalculator folder, where Git would keep track of everything.

Step 2: Configuring His Identity with git config

Before getting too far, Lucifer needed to make sure Git knew who he was. He configured his username and email address, so every change he made would be recorded in his name.

git config --global user.name "Lucifer"
git config --global user.email "lucifer@codeville.com"

Step 3: Writing the Addition Function and Staging It with git add

Lucifer began his calculator project by writing a simple function to add two numbers. He created a new Python file named main.py and added the following code,

# main.py

def add(x, y):
    return x + y

# Simple test to ensure it's working
print(add(5, 3))  # Output should be 8

Happy with his progress, Lucifer used the git add command to stage his changes. This was like preparing the code to be saved in Git’s memory.

git add main.py

Step 4: Committing the First Version with git commit

Next, Lucifer made his first commit. This saved the current state of his project, along with a message describing what he had done.

git commit -m "Added addition function"

Now, Git had recorded the addition function as the first chapter in the history of Lucifer’s project.

Step 5: Adding More Functions and Committing Them

Lucifer continued to add more functions to his calculator. First, he added subtraction,

# main.py

def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

# Simple tests
print(add(5, 3))       # Output: 8
print(subtract(5, 3))  # Output: 2

He then staged and committed the subtraction function,

git add main.py
git commit -m "Added subtraction function"

Lucifer added multiplication and division next,

# main.py

def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

def multiply(x, y):
    return x * y

def divide(x, y):
    if y != 0:
        return x / y
    else:
        return "Cannot divide by zero!"

# Simple tests
print(add(5, 3))       # Output: 8
print(subtract(5, 3))  # Output: 2
print(multiply(5, 3))  # Output: 15
print(divide(5, 3))    # Output: 1.666...
print(divide(5, 0))    # Output: Cannot divide by zero!

Again, he staged and committed these changes,

git add main.py
git commit -m "Added multiplication and division functions"

Step 6: Branching Out with git branch and git checkout

Lucifer had an idea to add a feature that would let users choose which operation to perform. However, he didn’t want to risk breaking his existing code. So, he created a new branch to work on this feature.

git branch operation-choice
git checkout operation-choice

Now on the operation-choice branch, Lucifer wrote the code to let users select an operation,

# main.py

def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

def multiply(x, y):
    return x * y

def divide(x, y):
    if y != 0:
        return x / y
    else:
        return "Cannot divide by zero!"

def calculator():
    print("Select operation:")
    print("1. Add")
    print("2. Subtract")
    print("3. Multiply")
    print("4. Divide")

    choice = input("Enter choice (1/2/3/4): ")

    num1 = float(input("Enter first number: "))
    num2 = float(input("Enter second number: "))

    if choice == '1':
        print(f"{num1} + {num2} = {add(num1, num2)}")

    elif choice == '2':
        print(f"{num1} - {num2} = {subtract(num1, num2)}")

    elif choice == '3':
        print(f"{num1} * {num2} = {multiply(num1, num2)}")

    elif choice == '4':
        print(f"{num1} / {num2} = {divide(num1, num2)}")

    else:
        print("Invalid input")

# Run the calculator
calculator()

Step 7: Merging the Feature into the Main Branch

After testing his new feature and making sure it worked, Lucifer was ready to merge it back into the main branch. He switched back to the main branch and merged the changes

git checkout main
git merge operation-choice

With this, the feature was successfully added to his calculator project.

Conclusion: Lucifer’s Git-Powered Calculator

By the end of his adventure, Lucifer had built a fully functional calculator and learned how to use Git to manage his code. His calculator could add, subtract, multiply, and divide, and even let users choose which operation to perform.

Thanks to Git, Lucifer’s project was well-organized, and he had a complete history of all the changes he made. He knew that if he ever needed to revisit an old version or experiment with new features, Git would be there to help.

Lucifer’s calculator project was a success, and with his newfound Git skills, he felt ready to take on even bigger challenges in the future.