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Basic Learning to Make a Calculator With PHP and HTML

What is Calculator ?



How to Create a Calculator in HTML And PHP


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 PHP



To create a calculator in PHP, follow these steps:

  1. Create a new PHP file and name it calculator.php
  2. Open the file and create a simple HTML form that allows the user to enter two numbers and select an operator. Here's an example:

    <!DOCTYPE html>
    <html>
    <head>
        <title>Calculator</title>
    </head>
    <body>
        <form action="calculator.php" method="post">
            <input type="text" name="num1" placeholder="Enter first number">
            <select name="operator">
                <option value="+">Add</option>
                <option value="-">Subtract</option>
                <option value="*">Multiply</option>
                <option value="/">Divide</option>
            </select>
            <input type="text" name="num2" placeholder="Enter second number">
            <input type="submit" value="Calculate">
        </form>
    </body>
    </html>


  3. In the same file, write the PHP code that will handle the form submission and perform the calculations. You can use the $_POST superglobal to retrieve the values submitted by the form, and then use a switch statement to perform the appropriate calculation based on the selected operator. Here's an example:

    <?php
    if(isset($_POST['num1']) && isset($_POST['num2']) && isset($_POST['operator'])){
        $num1 = $_POST['num1'];
        $num2 = $_POST['num2'];
        $operator = $_POST['operator'];
        switch($operator){
            case "+":
                $result = $num1 + $num2;
                break;
            case "-":
                $result = $num1 - $num2;
                break;
            case "*":
                $result = $num1 * $num2;
                break;
            case "/":
                $result = $num1 / $num2;
                break;
            default:
                $result = "Invalid operator";
                break;
        }
        echo "Result: ".$result;
    }
    ?>



  4. Save the file and upload it to your web server. You can then access the calculator by visiting the URL of the calculator.php file in your web browser.


That's it! You now have a simple calculator written in PHP. Note that this is just a basic example, and there are many ways to improve and customize it.






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




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