codeAlpha_BasicCalculator/index.html at main · ANU-IT-dev/codeAlpha_BasicCalculator · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>Basic Calculator</title>
  <style>
    body {
      background: #222;
      color: #fff;
      font-family: 'Segoe UI', sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }

    .calculator {
      background: #333;
      padding: 20px;
      border-radius: 15px;
      box-shadow: 0 0 10px #000;
    }

    #display {
      width: 100%;
      height: 60px;
      font-size: 2rem;
      text-align: right;
      margin-bottom: 10px;
      padding: 10px;
      border: none;
      border-radius: 10px;
      background: #111;
      color: #fff;
    }

    .buttons {
      display: grid;
      grid-template-columns: repeat(4, 80px);
      gap: 10px;
    }

    .btn {
      padding: 20px;
      font-size: 1.5rem;
      border: none;
      border-radius: 10px;
      background: #444;
      color: white;
      cursor: pointer;
      transition: 0.2s;
    }

    .btn:hover {
      background: #555;
    }

    .equal {
      background: #28a745;
      grid-row: span 2;
    }

    .equal:hover {
      background: #218838;
    }

    .zero {
      grid-column: span 2;
    }
  </style>
</head>
<body>
  <div class="calculator">
    <input type="text" id="display" disabled />
    <div class="buttons">
      <button class="btn" onclick="clearDisplay()">C</button>
      <button class="btn" onclick="deleteLast()">⌫</button>
      <button class="btn" onclick="appendOperator('/')">÷</button>
      <button class="btn" onclick="appendOperator('*')">×</button>

      <button class="btn" onclick="appendNumber('7')">7</button>
      <button class="btn" onclick="appendNumber('8')">8</button>
      <button class="btn" onclick="appendNumber('9')">9</button>
      <button class="btn" onclick="appendOperator('-')">−</button>

      <button class="btn" onclick="appendNumber('4')">4</button>
      <button class="btn" onclick="appendNumber('5')">5</button>
      <button class="btn" onclick="appendNumber('6')">6</button>
      <button class="btn" onclick="appendOperator('+')">+</button>

      <button class="btn" onclick="appendNumber('1')">1</button>
      <button class="btn" onclick="appendNumber('2')">2</button>
      <button class="btn" onclick="appendNumber('3')">3</button>
      <button class="btn equal" onclick="calculate()">=</button>

      <button class="btn zero" onclick="appendNumber('0')">0</button>
      <button class="btn" onclick="appendNumber('.')">.</button>
    </div>
  </div>

  <script>
    let display = document.getElementById('display');

    function appendNumber(num) {
      display.value += num;
    }

    function appendOperator(op) {
      const lastChar = display.value.slice(-1);
      if (['+', '-', '*', '/'].includes(lastChar)) {
        display.value = display.value.slice(0, -1) + op;
      } else if (display.value !== '') {
        display.value += op;
      }
    }

    function clearDisplay() {
      display.value = '';
    }

    function deleteLast() {
      display.value = display.value.slice(0, -1);
    }

    function calculate() {
      try {
        display.value = eval(display.value);
      } catch (e) {
        display.value = 'Error';
      }
    }
  </script>
</body>
</html>