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calculator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href="calculator.css">
<title>Calculator</title>
</head>
<body>
<div id="calculator">
<input type="text" id="display" readonly>
<div class="button-container">
<button class="button"onclick="
currentDisplay = '';
document.querySelector('#display').value = currentDisplay;
">c</button>
<button class="button" onclick="
currentDisplay = currentDisplay + '1';
document.querySelector('#display').value = currentDisplay;
">1</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '2';
document.querySelector('#display').value = currentDisplay;
">2</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '+';
document.querySelector('#display').value = currentDisplay;
">+</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '3';
document.querySelector('#display').value = currentDisplay;
">3</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '4';
document.querySelector('#display').value = currentDisplay;
">4</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '-';
document.querySelector('#display').value = currentDisplay;
">-</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '5';
document.querySelector('#display').value = currentDisplay;
">5</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '6';
document.querySelector('#display').value = currentDisplay;
">6</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '*';
document.querySelector('#display').value = currentDisplay;
">*</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '7';
document.querySelector('#display').value = currentDisplay;
">7</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '8';
document.querySelector('#display').value = currentDisplay;
">8</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '/';
document.querySelector('#display').value = currentDisplay;
">/</button>
<button class="button"onclick="
currentDisplay = eval(currentDisplay);
document.querySelector('#display').value = currentDisplay;
">=</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '9';
document.querySelector('#display').value = currentDisplay;
">9</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '0';
document.querySelector('#display').value = currentDisplay;
">0</button>
<button class="button"onclick="
currentDisplay = currentDisplay + '.';
document.querySelector('#display').value = currentDisplay;
">.</button>
</div>
</div>
<script>
let currentDisplay = '';
document.querySelector('#display').value = currentDisplay;
</script>
</body>
</html>