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calculator.html
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<!DOCTYPE html>
<html>
<head>
<title>Simple Calculator</title>
<style>
body {
font-family: sans-serif;
text-align: center;
}
input[type="text"] {
width: 200px;
padding: 10px;
margin: 10px;
border: 1px solid #ccc;
border-radius: 5px;
text-align: right;
}
button {
padding: 10px 20px;
margin: 5px;
border: none;
border-radius: 5px;
background-color: #4CAF50;
color: white;
cursor: pointer;
}
</style>
</head>
<body>
<h1>Simple Calculator</h1>
<input type="text" id="display" disabled>
<div>
<button onclick="append('7')">7</button>
<button onclick="append('8')">8</button>
<button onclick="append('9')">9</button>
<button onclick="append('/')">/</button>
</div>
<div>
<button onclick="append('4')">4</button>
<button onclick="append('5')">5</button>
<button onclick="append('6')">6</button>
<button onclick="append('*')">*</button>
</div>
<div>
<button onclick="append('1')">1</button>
<button onclick="append('2')">2</button>
<button onclick="append('3')">3</button>
<button onclick="append('-')">-</button>
</div>
<div>
<button onclick="append('0')">0</button>
<button onclick="append('.')">.</button>
<button onclick="calculate()">=</button>
<button onclick="append('+')">+</button>
</div>
<button onclick="clearDisplay()">C</button>
<script>
function append(value) {
document.getElementById('display').value += value;
}
function clearDisplay() {
document.getElementById('display').value = '';
}
function calculate() {
try {
document.getElementById('display').value = eval(document.getElementById('display').value);
} catch (error) {
document.getElementById('display').value = "Error";
}
}
</script>
</body>
</html>