<!DOCTYPE html>
<html>
<head>
<title>Kalkulator Sederhana</title>
<style>
#calculator {
width: 300px;
margin: 0 auto;
padding: 10px;
border: 1px solid #ccc;
border-radius: 5px;
}
input[type="text"] {
width: 100%;
padding: 10px;
font-size: 18px;
margin-bottom: 10px;
}
button {
width: 45px;
height: 45px;
font-size: 18px;
margin-right: 5px;
}
</style>
</head>
<body>
<div id="calculator">
<input type="text" id="display" readonly>
<br>
<button onclick="appendToDisplay('7')">7</button>
<button onclick="appendToDisplay('8')">8</button>
<button onclick="appendToDisplay('9')">9</button>
<button onclick="appendToDisplay('+')">+</button>
<br>
<button onclick="appendToDisplay('4')">4</button>
<button onclick="appendToDisplay('5')">5</button>
<button onclick="appendToDisplay('6')">6</button>
<button onclick="appendToDisplay('-')">-</button>
<br>
<button onclick="appendToDisplay('1')">1</button>
<button onclick="appendToDisplay('2')">2</button>
<button onclick="appendToDisplay('3')">3</button>
<button onclick="appendToDisplay('*')">*</button>
<br>
<button onclick="appendToDisplay('0')">0</button>
<button onclick="appendToDisplay('.')">.</button>
<button onclick="clearDisplay()">C</button>
<button onclick="appendToDisplay('/')">/</button>
<br>
<button onclick="calculateResult()">=</button>
</div>
<script>
function appendToDisplay(value) {
document.getElementById('display').value += value;
}
function clearDisplay() {
document.getElementById('display').value = '';
}
function calculateResult() {
const expression = document.getElementById('display').value;
try {
const result = eval(expression);
document.getElementById('display').value = result;
} catch (error) {
document.getElementById('display').value = 'Error';
}
}
</script>
</body>
</html>
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