Web-Development-Learning/basiccalculator.html at main · SPTteam/Web-Development-Learning · 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>Simple Calculator</title>
  <style>
    body {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      background: #f4f4f9;
      font-family: Arial, sans-serif;
    }
    .calculator {
      background: #fff;
      padding: 20px;
      border-radius: 12px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.2);
      width: 300px;
    }
    .display {
      width: 100%;
      height: 60px;
      margin-bottom: 15px;
      text-align: right;
      font-size: 24px;
      padding: 10px;
      border: none;
      background: #eee;
      border-radius: 8px;
    }
    .buttons {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 10px;
    }
    button {
      height: 60px;
      font-size: 18px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      background: #f0f0f0;
      transition: background 0.2s;
    }
    button:hover {
      background: #ddd;
    }
    .operator {
      background: #ff9500;
      color: white;
    }
    .operator:hover {
      background: #e08900;
    }
    .equal {
      background: #34c759;
      color: white;
      grid-column: span 2;
    }
    .equal:hover {
      background: #28a745;
    }
    .clear {
      background: #ff3b30;
      color: white;
      grid-column: span 2;
    }
    .clear:hover {
      background: #d32f2f;
    }
  </style>
</head>
<body>
  <div class="calculator">
    <input type="text" class="display" id="display" disabled>
    <div class="buttons">
      <button class="clear" onclick="clearDisplay()">C</button>
      <button onclick="appendValue('/')">÷</button>
      <button onclick="appendValue('*')">×</button>
      <button onclick="appendValue('7')">7</button>
      <button onclick="appendValue('8')">8</button>
      <button onclick="appendValue('9')">9</button>
      <button onclick="appendValue('-')">−</button>
      <button onclick="appendValue('4')">4</button>
      <button onclick="appendValue('5')">5</button>
      <button onclick="appendValue('6')">6</button>
      <button onclick="appendValue('+')">+</button>
      <button onclick="appendValue('1')">1</button>
      <button onclick="appendValue('2')">2</button>
      <button onclick="appendValue('3')">3</button>
      <button class="equal" onclick="calculate()">=</button>
      <button onclick="appendValue('0')">0</button>
      <button onclick="appendValue('.')">.</button>
    </div>
  </div>

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

    function appendValue(value) {
      display.value += value;
    }

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

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