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Create a Calculator Using the Python Flask Framework

What is Calculator?



How to Make a Calculator in HTML And Python

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 Make a Calculator in HTML And Python 



To create a calculator using Python and HTML, we need to use a web development framework such as Flask or Django, which allows us to build web applications using Python.

Here's an example using Flask:

  1. Install Flask by running pip install Flask in your terminal.

  2. Create a new Python file called app.py and add the following code:


    from flask import Flask, render_template, request

    app = Flask(__name__)

    @app.route('/')
    def index():
        return render_template('calculator.html')

    @app.route('/calculate', methods=['POST'])
    def calculate():
        num1 = int(request.form['num1'])
        num2 = int(request.form['num2'])
        operator = request.form['operator']
       
        if operator == 'add':
            result = num1 + num2
        elif operator == 'subtract':
            result = num1 - num2
        elif operator == 'multiply':
            result = num1 * num2
        elif operator == 'divide':
            result = num1 / num2
       
        return render_template('calculator.html', result=result)

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


    In this code, we import the Flask module and create a new Flask application. We define two routes, one for the home page (/) that renders a template called calculator.html, and another route (/calculate) that is called when the user submits the form in the calculator.

    The calculate route gets the two numbers and operator from the form data and performs the appropriate operation. It then renders the calculator.html template again, passing in the result as a variable.

  3. Create a new HTML file called calculator.html and add the following code:


    <!DOCTYPE html>
    <html>
    <head>
        <title>Calculator</title>
    </head>
    <body>
        <h1>Calculator</h1>
        <form method="POST" action="{{ url_for('calculate') }}">
            <input type="number" name="num1" required>
           
            <select name="operator" required>
                <option value="add">+</option>
                <option value="subtract">-</option>
                <option value="multiply">*</option>
                <option value="divide">/</option>
            </select>
           
            <input type="number" name="num2" required>
           
            <input type="submit" value="Calculate">
        </form>
       
        {% if result %}
            <h2>Result: {{ result }}</h2>
        {% endif %}
    </body>
    </html>



    This HTML file defines a simple form that asks the user for two numbers and an operator. When the form is submitted, it sends a POST request to the /calculate route that we defined in app.py. The result of the calculation is then displayed below the form.

  4. Run the application by executing python app.py in your terminal. You should see a message saying "Running on http://127.0.0.1:5000/".

  5. Open a web browser and go to http://127.0.0.1:5000/ to see the calculator in action.



See the article about javascript here:

  1. Learn Array Method - forEach, map, reduce, filter
  2. Learn Basics Array In Javascript
  3. Learn Basics Asynchronous In Javascript
  4. How To Change String Value Using Replace in Javascript
  5. How to Learn a Calculator Basic in Javascript
  6. Basic Learning to Make a Calculator With PHP and HTML




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Jamal Wednesday, March 1, 2023 Tags: calculator, python00