Simple Calculator in Python

July 10, 2024

Introduction

In this guide, you'll learn how to create a simple command-line calculator in Python.

Step 1: Define the Calculator Functions

Create a Python script with the following code:


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 "Error: Division by zero"
    return x / y

# Main function to handle user input
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(num1, "+", num2, "=", add(num1, num2))
    elif choice == '2':
        print(num1, "-", num2, "=", subtract(num1, num2))
    elif choice == '3':
        print(num1, "*", num2, "=", multiply(num1, num2))
    elif choice == '4':
        print(num1, "/", num2, "=", divide(num1, num2))
    else:
        print("Invalid input")

# Run the calculator
calculator()

Step 2: Run the Calculator

Save the Python script with a .py extension (e.g., calculator.py).

Open a terminal, navigate to the directory where the script is saved, and run:

python3 calculator.py

Step 3: Use the Calculator

Follow the prompts in the terminal to perform calculations with your simple Python calculator.

Conclusion

Congratulations! You've created a simple command-line calculator in Python. This calculator can perform basic arithmetic operations such as addition, subtraction, multiplication, and division. Experiment with the code and add more functionalities if desired!

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