<html>
<head>
<title>calcutor</title>
</head>
<body> <center>
<form name="from1">
<input type="text" name="answer" id=" text">
<br> <br>
<input type="button" value="1" onclick="from1.answer.value +='1'" >
<input type="button" value="2" onclick="from1.answer.value+='2'">
<input type="button" value="3" onclick="from1.answer.value += '3'">
<input type="button" value="+" onclick="from1.answer.value += '+'">
<br> <br>
<input type="button" value="4" onclick="from1.answer.value +='4'">
<input type="button" value="5" onclick="from1.answer.value +='5'">
<input type="button" value="6" onclick="from1.answer.value +='6'">
<input type="button" value="-" onclick="from1.answer.value += '-'">
<br> <br>
<input type="button" value="7" onclick="from1.answer.value +='7'">
<input type="button" value="8" onclick="from1.answer.value +='8'">
<input type="button" value="9" onclick="from1.answer.value +='9'">
<input type="button" value="×" onclick="from1.answer.value +='*'">
<br> <br>
<input type="button" value="00" onclick="from1.answer.value +='00'">
<input type="button" value="0" onclick="from1.answer.value +='0'">
<input type="button" value="." onclick="from1.answer.value +='.'">
<input type="button" value="=" onclick="from1.answer.value= eval(from1. answer.value)">
</form>
</body>
</html>
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