Tastiera digitale by @LeoMosc - Codewith.it

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References

valueValore alfanumerico o booleano contenuto in un elemento
enctypeDetermina il tipo di codifica dei dati di un form per l'invio al server
<object>Incorpora risorse varie nella pagina web.
<h1>Titolo di intestazione di primo livello
widthImposta la larghezza di un elemento HTML
heightDetermina l'altezza di un elemento HTML in pixel

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<!DOCTYPE html>
<html>
<head>
    <title>Calcolatrice</title>
    <link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
    <div class="container">
        <h2>Calcolatrice</h2>
        <div class="input-field">
            <input type="text" id="display" readonly>
        </div>
        <div class="input-field">
            <button class="button" onclick="insert('7')">7</button>
            <button class="button" onclick="insert('8')">8</button>
            <button class="button" onclick="insert('9')">9</button>
            <button class="button" onclick="insert('/')">÷</button>
        </div>
        <div class="input-field">
            <button class="button" onclick="insert('4')">4</button>
            <button class="button" onclick="insert('5')">5</button>
            <button class="button" onclick="insert('6')">6</button>
            <button class="button" onclick="insert('*')">×</button>
        </div>
        <div class="input-field">
            <button class="button" onclick="insert('1')">1</button>
            <button class="button" onclick="insert('2')">2</button>
            <button class="button" onclick="insert('3')">3</button>
            <button class="button" onclick="insert('-')">-</button>
        </div>
        <div class="input-field">
            <button class="button" onclick="insert('0')">0</button>
            <button class="button" onclick="clearDisplay()">C</button>
            <button class="button" onclick="calculate()">=</button>
            <button class="button" onclick="insert('+')">+</button>
        </div>
    </div>

    <script src="script.js"></script>
</body>
</html>

.container {
    width: 500px;
    padding: 20px;
    border: 20px solid #ffff72;
    border-radius: 10px;
    text-align: center;
    background-color: rgb(192, 255, 173);
    font-family: Arial, sans-serif;
}

.input-field {
    margin-bottom: 10px;
}

.button {
    width: 50px;
    height: 50px;
    margin: 5px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: #d9ead3;
    color: #555;
}

#display {
    width: 100%;
    height: 40px;
    margin-bottom: 10px;
    text-align: right;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: Arial, sans-serif;
}

function insert(value) {
    document.getElementById("display").value += value;
}

function clearDisplay() {
    document.getElementById("display").value = "";
}

function calculate() {
    var displayValue = document.getElementById("display").value;
    var result = eval(displayValue);
    document.getElementById("display").value = result;
}