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Basic Calculator.html
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<html>
<head>
<title> A Simple Calculator </title>
<link rel="stylesheet" href="calc.css">
</head>
<body>
<div class="container">
<h1>
Online Calculator
</h1>
<fieldset id="container">
<form name="calculator">
<input id="display" type="text" name="display" readonly>
<input class="button digits" type="button" value="7" onclick="calculator.display.value += '7'">
<input class="button digits" type="button" value="8" onclick="calculator.display.value += '8'">
<input class="button digits" type="button" value="9" onclick="calculator.display.value += '9'">
<input class="button mathOperations" type="button" value="+" onclick="calculator.display.value += '+'">
<br>
<input class="button digits" type="button" value="4" onclick="calculator.display.value += '4'">
<input class="button digits" type="button" value="5" onclick="calculator.display.value += '5'">
<input class="button digits" type="button" value="6" onclick="calculator.display.value += '6'">
<input class="button mathOperations" type="button" value="-" onclick="calculator.display.value += '-'">
<br>
<input class="button digits" type="button" value="1" onclick="calculator.display.value += '1'">
<input class="button digits" type="button" value="2" onclick="calculator.display.value += '2'">
<input class="button digits" type="button" value="3" onclick="calculator.display.value += '3'">
<input class="button mathOperations" type="button" value="X" onclick="calculator.display.value += '*'">
<br>
<input class="button digits" type="button" value="<" onclick="calculator.display.value = calculator.display.value.substring(0, calculator.display.value.length * 1 - 1)">
<input class="button digits" type="button" value="0" onclick="calculator.display.value += '0'">
<input class="button digits" type="button" value="." onclick="calculator.display.value += '.'">
<input class="button mathOperations" type="button" value="/" onclick="calculator.display.value += '/'">
<hr>
<input id="clearButton" class="button" type="button" value="C" onclick="calculator.display.value = ''">
<input id="buttonEqualsTo" type="button" value="=" onclick="calculator.display.value = eval(calculator.display.value)">
</form>
</fieldset>
</div>
</body>
</html>