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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css" id="">
<title>Calculator</title>
</head>
<body>
<div id="calculator">
<input type="text" id="display" readonly>
<div class="inhalt">
<div class="col1">
<button onclick="appendToDisplay('7')">7</button>
<button onclick="appendToDisplay('8')">8</button>
<button onclick="appendToDisplay('9')">9</button>
<button onclick="appendToDisplay('/')">/</button>
</div>
<div class="col2">
<button onclick="appendToDisplay('4')">4</button>
<button onclick="appendToDisplay('5')">5</button>
<button onclick="appendToDisplay('6')">6</button>
<button onclick="appendToDisplay('*')">*</button>
</div>
<div class="col3">
<button onclick="appendToDisplay('1')">1</button>
<button onclick="appendToDisplay('2')">2</button>
<button onclick="appendToDisplay('3')">3</button>
<button onclick="appendToDisplay('-')">-</button>
</div>
<div class="col4">
<button onclick="appendToDisplay('0')">0</button>
<button onclick="appendToDisplay('.')">.</button>
<button onclick="calculate()">=</button>
<button onclick="appendToDisplay('+')">+</button>
<button onclick="clearDisplay()" id="c">Clear</button>
</div>
</div>
<br>
</div>
<script>
function clearDisplay() {
document.getElementById('display').value = '';
}
function appendToDisplay(value) {
document.getElementById('display').value += value;
}
function calculate() {
try {
document.getElementById('display').value = eval(document.getElementById('display').value);
} catch (error) {
document.getElementById('display').value = 'Error';
}
}
</script>
</body>
</html>