<!DOCTYPE html>
<html>
<head>
<title>Calculadora Básica</title>
<style>
body {
font-family: Arial, sans-serif;
}
.calculator {
width: 200px;
border: 1px solid #ccc;
padding: 10px;
margin: 0 auto;
}
.result {
margin-bottom: 10px;
}
button {
width: 40px;
height: 40px;
font-size: 18px;
margin: 5px;
}
</style>
</head>
<body>
<div class="calculator">
<div class="result">
<input type="text" id="result" disabled>
</div>
<button onclick="appendNumber('7')">7</button>
<button onclick="appendNumber('8')">8</button>
<button onclick="appendNumber('9')">9</button>
<button onclick="appendOperator('+')">+</button>
<br>
<button onclick="appendNumber('4')">4</button>
<button onclick="appendNumber('5')">5</button>
<button onclick="appendNumber('6')">6</button>
<button onclick="appendOperator('-')">-</button>
<br>
<button onclick="appendNumber('1')">1</button>
<button onclick="appendNumber('2')">2</button>
<button onclick="appendNumber('3')">3</button>
<button onclick="appendOperator('*')">*</button>
<br>
<button onclick="appendNumber('0')">0</button>
<button onclick="clearInput()">C</button>
<button onclick="calculate()">=</button>
<button onclick="appendOperator('/')">/</button>
</div>
<script>
function appendNumber(number) {
document.getElementById('result').value += number;
}
function appendOperator(operator) {
document.getElementById('result').value += operator;
}
function clearInput() {
document.getElementById('result').value = '';
}
function calculate() {
try {
const result = eval(document.getElementById('result').value);
document.getElementById('result').value = result;
} catch (error) {
document.getElementById('result').value = 'Error';
}
}
</script>
</body>
</html>
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