Python Simple Calculator with Square Root

Introduction

This guide shows how to create a simple calculator in Python that can perform basic arithmetic operations including square roots. Python is a versatile programming language that's great for beginners and experienced developers alike.

Whether you're learning Python or need a quick calculation tool, this calculator implementation will help you understand how to handle mathematical operations programmatically.

How to Use the Calculator

The interactive calculator on the right allows you to test different calculations. Simply enter two numbers and select an operation, then click "Calculate".

The calculator supports these operations:

• Addition (+)
• Subtraction (-)
• Multiplication (*)
• Division (/)
• Square Root (√)

For square root operations, only the first number input is used. The second number input will be ignored.

Python Code Implementation

Here's the complete Python code for the calculator:

import math

def simple_calculator():
    print("Simple Calculator")
    print("Operations:")
    print("1. Addition (+)")
    print("2. Subtraction (-)")
    print("3. Multiplication (*)")
    print("4. Division (/)")
    print("5. Square Root (√)")

    while True:
        try:
            num1 = float(input("Enter first number: "))
            operation = input("Enter operation (1/2/3/4/5): ")
            if operation != '5':
                num2 = float(input("Enter second number: "))

            if operation == '1':
                print(f"Result: {num1} + {num2} = {num1 + num2}")
            elif operation == '2':
                print(f"Result: {num1} - {num2} = {num1 - num2}")
            elif operation == '3':
                print(f"Result: {num1} * {num2} = {num1 * num2}")
            elif operation == '4':
                if num2 == 0:
                    print("Error: Division by zero")
                else:
                    print(f"Result: {num1} / {num2} = {num1 / num2}")
            elif operation == '5':
                if num1 < 0:
                    print("Error: Square root of negative number")
                else:
                    print(f"Result: √{num1} = {math.sqrt(num1)}")
            else:
                print("Invalid operation")

            another = input("Calculate another? (yes/no): ")
            if another.lower() != 'yes':
                break

        except ValueError:
            print("Invalid input. Please enter numbers only.")

simple_calculator()

The code includes error handling for invalid inputs and division by zero. The square root function uses Python's math.sqrt() which returns a floating-point number.

Examples

Example 1: Addition

Input:

• First number: 5
• Operation: 1 (Addition)
• Second number: 3

Output:

Result: 5 + 3 = 8

Example 2: Square Root

Input:

• First number: 25
• Operation: 5 (Square Root)

Output:

Result: √25 = 5.0

Example 3: Division by Zero

Input:

• First number: 10
• Operation: 4 (Division)
• Second number: 0

Output:

Error: Division by zero