Myproject/calculator.html at main · CodeWithSameer-x/Myproject · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Black Themed Calculator</title>
  <style>
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Segoe UI', sans-serif;
      background: #000;
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100vh;
    }
    .calculator {
      background: #111;
      padding: 20px;
      border-radius: 15px;
      box-shadow: 0 0 20px #0f0;
      width: 320px;
    }
    .display {
      background: #222;
      color: #0f0;
      font-size: 2em;
      padding: 15px;
      text-align: right;
      border-radius: 10px;
      margin-bottom: 15px;
      overflow-x: auto;
    }
    .buttons {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 10px;
    }
    .btn {
      padding: 20px;
      background: #333;
      color: #fff;
      font-size: 1.2em;
      border: none;
      border-radius: 10px;
      cursor: pointer;
      transition: background 0.2s;
    }
    .btn:hover {
      background: #0f0;
      color: #000;
    }
    .btn.operator {
      background: #f90;
      color: #000;
    }
    .btn.operator:hover {
      background: #ff0;
    }
    .btn.equal {
      grid-column: span 2;
      background: #0f0;
      color: #000;
    }
    .btn.equal:hover {
      background: #afa;
    }
  </style>
</head>
<body>
  <div class="calculator">
    <div class="display" id="display">0</div>
    <div class="buttons">
      <button class="btn" onclick="clearDisplay()">C</button>
      <button class="btn" onclick="square()">x²</button>
      <button class="btn" onclick="sqrt()">√</button>
      <button class="btn operator" onclick="appendOperator('/')">÷</button>

      <button class="btn" onclick="appendValue('7')">7</button>
      <button class="btn" onclick="appendValue('8')">8</button>
      <button class="btn" onclick="appendValue('9')">9</button>
      <button class="btn operator" onclick="appendOperator('*')">×</button>

      <button class="btn" onclick="appendValue('4')">4</button>
      <button class="btn" onclick="appendValue('5')">5</button>
      <button class="btn" onclick="appendValue('6')">6</button>
      <button class="btn operator" onclick="appendOperator('-')">−</button>

      <button class="btn" onclick="appendValue('1')">1</button>
      <button class="btn" onclick="appendValue('2')">2</button>
      <button class="btn" onclick="appendValue('3')">3</button>
      <button class="btn operator" onclick="appendOperator('+')">+</button>

      <button class="btn" onclick="appendValue('0')">0</button>
      <button class="btn" onclick="appendValue('.')">.</button>
      <button class="btn equal" onclick="calculate()">=</button>
    </div>
  </div>

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

    function appendValue(value) {
      if (display.innerText === '0') display.innerText = '';
      display.innerText += value;
    }

    function appendOperator(op) {
      const lastChar = display.innerText.slice(-1);
      if ("+-*/".includes(lastChar)) {
        display.innerText = display.innerText.slice(0, -1) + op;
      } else {
        display.innerText += op;
      }
    }

    function clearDisplay() {
      display.innerText = '0';
    }

    function calculate() {
      try {
        display.innerText = eval(display.innerText);
      } catch {
        display.innerText = 'Error';
      }
    }

    function square() {
      try {
        let val = eval(display.innerText);
        display.innerText = val * val;
      } catch {
        display.innerText = 'Error';
      }
    }

    function sqrt() {
      try {
        let val = eval(display.innerText);
        display.innerText = Math.sqrt(val);
      } catch {
        display.innerText = 'Error';
      }
    }
  </script>
</body>
</html>