Creating a calculator using HTML, CSS, and Python (Flask)

Friday, April 28, 2023

How the Calculator works

Creating a calculator using HTML, CSS, and Python (Flask)

buayaberdiri.blogspot.com - A calculator is a tool or device that is used to perform mathematical calculations. It can perform a wide range of mathematical operations such as addition, subtraction, multiplication, division, exponentiation, and more complex operations like trigonometric and logarithmic functions. Calculators can be physical devices with buttons and screens, or they can be software applications that run on a computer or a mobile device.

A calculator works by taking numerical inputs from the user, either through physical buttons or on-screen buttons, and performing a mathematical operation on those inputs to produce a result. The user enters numbers and the calculator performs operations based on the buttons that are pressed. Modern calculators can perform more advanced mathematical functions beyond basic arithmetic, and some calculators can even be programmed to perform custom functions or equations.

The process of using a calculator involves entering the values and operators for the desired calculation, and then pressing the "=" button to obtain the result. For example, to add two numbers, the user would enter the first number, press the "+" button, enter the second number, and then press the "=" button to obtain the sum of the two numbers. The calculator then performs the calculation and displays the result.

How to create calculator using html css and python

Creating a calculator using HTML, CSS, and Python involves building a user interface with HTML and CSS and implementing the calculator's functionality with Python.

Here are the general steps you can follow:

Create the HTML structure for the calculator interface. This may include buttons for numbers, operators, and other functions, as well as a display area for the results.
Use CSS to style the calculator interface, including the font, color, and layout.
Create a Python script to handle the calculator's functionality. This may include defining functions for arithmetic operations, handling user input from the interface, and updating the display area with the results.
Use Flask or another Python web framework to create a web application that runs the Python script and serves the HTML/CSS interface.
Test and refine the calculator application until it works as desired.

Here is some sample code to get you started:

1. HTML code for the calculator interface:

<!DOCTYPE html>
<html>
  <head>
    <title>Calculator</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div class="calculator">
      <div class="display">
        <p id="result"></p>
      </div>
      <div class="buttons">
        <button class="number" id="btn-1">1</button>
        <button class="number" id="btn-2">2</button>
        <button class="number" id="btn-3">3</button>
        <button class="operator" id="btn-plus">+</button>
        <button class="number" id="btn-4">4</button>
        <button class="number" id="btn-5">5</button>
        <button class="number" id="btn-6">6</button>
        <button class="operator" id="btn-minus">-</button>
        <button class="number" id="btn-7">7</button>
        <button class="number" id="btn-8">8</button>
        <button class="number" id="btn-9">9</button>
        <button class="operator" id="btn-multiply">*</button>
        <button class="number" id="btn-0">0</button>
        <button class="operator" id="btn-clear">C</button>
        <button class="operator" id="btn-equal">=</button>
        <button class="operator" id="btn-divide">/</button>
      </div>
    </div>
    <script src="script.js"></script>
  </body>
</html>

2. CSS code for the calculator interface:

.calculator {
    width: 250px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin: 0 auto;
    padding: 10px;
  }
  
  .display {
    height: 50px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin-bottom: 10px;
    text-align: right;
    padding: 10px;
  }
  
  .buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }
  
  button {
    height: 50px;
    border-radius: 5px;
    border: none;
    background-color: #eee;
    font-size: 20px;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #ddd;
  }
  

3. Python code for the calculator functionality using Flask:

from flask import Flask, render_template, request

app = Flask(__name__)

@app.route('/')
def calculate():
  # Retrieve user input from the form
  num1 = request.form['num1']
  num2 = request.form['num2']
  operator = request.form['operator']

  # Perform the arithmetic operation based on the operator
  if operator == '+':
    result = int(num1) + int(num2)
  elif operator == '-':
    result = int(num1) - int(num2)
  elif operator == '*':
    result = int(num1) * int(num2)
  elif operator == '/':
    result = int(num1) / int(num2)

  # Return the result to be displayed in the interface
  return str(result)

@app.route('/', methods=['POST'])
def calculate_result():
  # Call the calculate function to get the result
  result = calculate()

  # Render the template with the result to update the interface
  return render_template('index.html', result=result)

if __name__ == '__main__':
  app.run(debug=True)

This code defines a calculate function that retrieves the user input from the form, performs the arithmetic operation, and returns the result as a string. It also defines a calculate_result function that calls the calculate function and renders the index.html template with the result to update the interface.

To run this code, save it in a file named app.py and run python app.py in the terminal. Then open a web browser and go to http://localhost:5000 to see the calculator interface.

See the article about javascript here:

Check out other articles about HTML & CSS:

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