A simple online arithmetic calculator using PHP programming language that can perform addition, subtraction, multiplication, and division.

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Program Listing

    $form = "";
    $solution = "display:none;";
    if(isset($_POST["operand1"], $_POST["operand2"], $_POST["operation"])) {
        switch ($_POST["operation"]) {
            case 'Add':
                $calc = $_POST["operand1"] + $_POST["operand2"];
                $operand1 = "1st Addend is ".$_POST["operand1"];
                $operand2 = "2nd Addend is ".$_POST["operand2"];
                $result   = "The Sum is ".$calc;
            case 'Subtract':
                $calc = $_POST["operand1"] - $_POST["operand2"];
                $operand1 = "Minuend is ".$_POST["operand1"];
                $operand2 = "Subtrahend is ".$_POST["operand2"];
                $result   = "The Difference is ".$calc;
            case 'Multiply':
                $calc = $_POST["operand1"] * $_POST["operand2"];
                $operand1 = "Multiplicand is ".$_POST["operand1"];
                $operand2 = "Multiplier is ".$_POST["operand2"];
                $result   = "The Product is ".$calc;
            case 'Divide':
                $calc = $_POST["operand1"] / $_POST["operand2"];
                $operand1 = "Dividend is ".$_POST["operand1"];
                $operand2 = "Divisor is ".$_POST["operand2"];
                $result   = "The Qoutient is ".$calc;
        $form = "display:none;";
        $solution = "";
<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Online Arithmetic Calculator in PHP</title>
        *, html {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        body {
            display: flex;
            justify-content: center;
        h1 {
            font-size: 40px;
            border-top: 1px solid #000;
            border-bottom: 1px solid #000;
            padding: 5px;
            margin-bottom: 20px;
            text-align: center;
        label {
            font-size: 20px;
        .container {
            margin-top: 15vh;
            padding: 10px;
        form {
            display: flex;
            flex-direction: column;
            justify-content: center;
        .wrapper {
            display: block;
            margin: 0 auto 10px;
            width: 300px;
        input {
            padding: 5px;
            font-size: 14px;
        table {
            margin-left: 30px;
        .operations table td label,
        .operations table td input {
            cursor: pointer;
        button {
            padding: 8px;
            width: 90px;
        .border {
            padding: 50px;
            border: 1px solid #000;
        .border h2 {
            font-size: 25px;
            margin-bottom: 5px;
        .border p {
            margin-bottom: 5px;
    <main class="container">
        <div style="<?= $form; ?>">
            <h1>My Online Arithmetic Calculator in PHP</h1>
			 <h3 align='center'> Jake Rodriguez Pomperada, MAED-IT,MIT </h3>
            <form action="" method="post">
                <div class="wrapper">
                    <label for="">Operand #1: </label>
                    <input type="number" name="operand1" placeholder="Enter a number" required>
                <div class="wrapper">
                    <label for="">Operand #2: </label>
                    <input type="number" name="operand2" placeholder="Enter a number" required>
                <div class="wrapper operations">
                    <label>Choose Operation:</label>
                                <input type="radio" name="operation" id="Add" value="Add" checked>
                                <label for="Add">- Add</label>
                                <input type="radio" name="operation" id="Subtract" value="Subtract">
                                <label for="Subtract">- Subtract</label>
                                <input type="radio" name="operation" id="Multiply" value="Multiply">
                                <label for="Multiply">- Multiply</label>
                                <input type="radio" name="operation" id="Divide" value="Divide">
                                <label for="Divide">- Divide</label>
                <div class="wrapper">
                    <button type="submit">Submit</button>
        <div class="border" style="<?= $solution; ?>">
            <p>You sent the following values:</p>
            <p><?= $operand1; ?></p>
            <p><?= $operand2; ?></p>
            <p><?= $result; ?></p>