Quick calculator using HTML,CSS and Java Script.

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 >>HTML codes.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="cal.css">
    <title>Calculator</title>
</head>
<body>
    <div class="calculator">
        <input type="text" id="display" disabled>
        <div class="buttons">
            <button onclick="appendToDisplay('7')">7</button>
            <button onclick="appendToDisplay('8')">8</button>
            <button onclick="appendToDisplay('9')">9</button>
            <button onclick="appendToDisplay('+')">+</button>
            <button onclick="appendToDisplay('4')">4</button>
            <button onclick="appendToDisplay('5')">5</button>
            <button onclick="appendToDisplay('6')">6</button>
            <button onclick="appendToDisplay('-')">-</button>
            <button onclick="appendToDisplay('1')">1</button>
            <button onclick="appendToDisplay('2')">2</button>
            <button onclick="appendToDisplay('3')">3</button>
            <button onclick="appendToDisplay('*')">*</button>
            <button onclick="appendToDisplay('0')">0</button>
            <button onclick="clearDisplay()">C</button>
            <button onclick="calculate()">=</button>
            <button onclick="appendToDisplay('/')">/</button>
        </div>
    </div>
    </container>
</body>
<script src="cal.js"></script>
</html>


>>CSS codes.

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color:black;
  }
 
  .calculator {
    width: 300px;
    border: 1px solid #ccc;
    border-radius: 5px;
    padding: 10px;
    background-color: #fff;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
  }
 
  #display {
    width: 100%;
    height: 50px;
    font-size: 20px;
    text-align: right;
    margin-bottom: 10px;
    border: 1px solid:whitesmoke;
    border-radius: 5px;
    padding: 5px;
  }
 
  .buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
  }
 
  button {
    width: 95%;
    height: 50px;
    font-size: 25px;
    background-color: red;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
  }
 
  button:hover {
    background-color: #ccc;
  }
 

>> JAVA codes

let displayValue = "";

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

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

function calculate() {
    try {
        displayValue = eval(displayValue).toString();
        document.getElementById("display").value = displayValue;
    } catch (error) {
        document.getElementById("display").value = "Error";
    }
}

>> Output data:

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