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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>3 JavaScript calculator</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<form action="/" name="cal">
<input type="text" readonly class="value" name="text">
<span class="num operators" onclick="document.cal.text.value+='/'">/</span>
<span class="num operators" onclick="document.cal.text.value+='+'">+</span>
<span class="num operators" onclick="document.cal.text.value+='-'">-</span>
<span class="num operators" onclick="document.cal.text.value+='*'">X</span>
<span class="num num_key" onclick="document.cal.text.value+='7'">7</span>
<span class="num num_key" onclick="document.cal.text.value+='8'">8</span>
<span class="num num_key" onclick="document.cal.text.value+='9'">9</span>
<span class="num operators clear" onclick="document.cal.text.value=''">C</span>
<span class="num num_key" onclick="document.cal.text.value+='4'">4</span>
<span class="num num_key" onclick="document.cal.text.value+='5'">5</span>
<span class="num num_key" onclick="document.cal.text.value+='6'">6</span>
<span class="num operators" onclick="document.cal.text.value='.'">.</span>
<span class="num num_key" onclick="document.cal.text.value+='3'">3</span>
<span class="num num_key" onclick="document.cal.text.value+='2'">2</span>
<span class="num num_key" onclick="document.cal.text.value+='1'">1</span>
<span class="num operators" onclick="document.cal.text.value+='0'">0</span>
<!-- <span class="num" onclick="document.cal.text.value+='0'">></span> -->
<span class="num calculate" onclick="document.cal.text.value=eval(cal.text.value)">=</span>
</form>
</div>
</body>
</html>