<![CDATA[<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>Calculator | Learn With Arshyan</title>
<style>
body {
font-family: Arial, sans-serif;
background: #f2f2f2;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
.calculator {
background: #fff;
border-radius: 10px;
box-shadow: 0 0 15px rgba(0,0,0,0.1);
width: 300px;
padding: 20px;
}
.display {
background: #222;
color: #fff;
font-size: 2em;
text-align: right;
padding: 15px;
border-radius: 5px;
margin-bottom: 20px;
overflow-x: auto;
}
.buttons {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 10px;
}
.buttons button {
padding: 20px;
font-size: 1.2em;
border: none;
border-radius: 5px;
background: #e0e0e0;
cursor: pointer;
transition: background 0.2s;
}
.buttons button.operator {
background: #007bff;
color: white;
}
.buttons button.clear {
background: #dc3545;
color: white;
}
.buttons button.equal {
background: #28a745;
color: white;
grid-column: span 2;
}
.buttons button:hover {
background: #ccc;
}
@media (max-width: 400px) {
.calculator {
width: 90%;
}
}
</style>
</head>
<body>
<div class="calculator">
<div class="display" id="display">0</div>
<div class="buttons">
<!-- Row 1 -->
<button class="clear" onclick="clearDisplay()">C</button>
<button onclick="append('.')">.</button>
<button onclick="append('0')">0</button>
<button class="operator" onclick="append('/')">÷</button>
<!-- Row 2 -->
<button onclick="append('1')">1</button>
<button onclick="append('2')">2</button>
<button onclick="append('3')">3</button>
<button class="operator" onclick="append('*')">×</button>
<!-- Row 3 -->
<button onclick="append('4')">4</button>
<button onclick="append('5')">5</button>
<button onclick="append('6')">6</button>
<button class="operator" onclick="append('-')">−</button>
<!-- Row 4 -->
<button onclick="append('7')">7</button>
<button onclick="append('8')">8</button>
<button onclick="append('9')">9</button>
<button class="operator" onclick="append('+')">+</button>
<!-- Equal Button -->
<button class="equal" onclick="calculate()">=</button>
</div>
</div>
<script>
const display = document.getElementById('display');
// Append character to the display
function append(value) {
if (display.innerText === '0') {
display.innerText = value;
} else {
display.innerText += value;
}
}
// Clear the display
function clearDisplay() {
display.innerText = '0';
}
// Evaluate the expression
function calculate() {
try {
display.innerText = eval(display.innerText);
} catch {
display.innerText = 'Error';
}
}
</script>
</body>
</html>
]]>
