projec-jss/4_basiccalculator.html at main · jatin-563/projec-jss · GitHub

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<!DOCTYPE html>
<html>
<head>
  <title>Basic Calculator</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      text-align: center;
      padding-top: 50px;
    }
    input {
      width: 100px;
      padding: 8px;
      margin: 5px;
      font-size: 16px;
    }
    select, button {
      padding: 8px;
      font-size: 16px;
      margin: 5px;
    }
    #result {
      margin-top: 20px;
      font-size: 20px;
      font-weight: bold;
    }
  </style>
</head>
<body>
  <h1>Basic Calculator</h1>
  <input type="number" id="num1" placeholder="Number 1">
  <input type="number" id="num2" placeholder="Number 2">
  <select id="operator">
    <option value="+">+</option>
    <option value="-">−</option>
    <option value="*">×</option>
    <option value="/">÷</option>
  </select>
  <button onclick="calculate()">Calculate</button>

  <div id="result">Result: </div>

  <script>
    function calculate() {
      const n1 = parseFloat(document.getElementById('num1').value);
      const n2 = parseFloat(document.getElementById('num2').value);
      const op = document.getElementById('operator').value;
      let res;

      if (isNaN(n1) || isNaN(n2)) {
        res = "Please enter valid numbers.";
      } else {
        switch (op) {
          case '+':
            res = n1 + n2;
            break;
          case '-':
            res = n1 - n2;
            break;
          case '*':
            res = n1 * n2;
            break;
          case '/':
            res = n2 !== 0 ? (n1 / n2).toFixed(2) : "Cannot divide by zero";
            break;
        }
      }

      document.getElementById('result').textContent = `Result: ${res}`;
    }
  </script>
</body>
</html>