Membuat kalkulator

<!doctype html>
<html>
<head>
<title>Kalkulator</title>
</head>
<body>
<form name="proses">
<table border="1">
<tr align="center">
<td colspan="4"><input type="text" name="Input" size="15"></td>
</tr>
<tr align="center">
<td><input type="button" name="tambah" value=" + " OnClick="proses.Input.value += ' + '"></td>
<td><input type="button" name="kurang" value=" - " OnClick="proses.Input.value += ' - '"></td>
<td><input type="button" name="kali" value=" x " OnClick="proses.Input.value += ' * '"></td>
<td><input type="button" name="bagi" value=" / " OnClick="proses.Input.value += ' / '"></td>
</tr>
<tr>
<td colspan="4">
<input type="button" name="satu" value=" 1 " OnClick="proses.Input.value += '1'">
<input type="button" name="dua" value=" 2 " OnCLick="proses.Input.value += '2'">
<input type="button" name="tiga" value=" 3 " OnClick="proses.Input.value += '3'">
<input type="button" name="empat" value=" 4 " OnClick="proses.Input.value += '4'">
<br>
<input type="button" name="lima" value=" 5 " OnCLick="proses.Input.value += '5'">
<input type="button" name="enam" value=" 6 " OnClick="proses.Input.value += '6'">    
<input type="button" name="tujuh" value=" 7 " OnClick="proses.Input.value += '7'">
<input type="button" name="delapan" value=" 8 " OnCLick="proses.Input.value += '8'">
<br>
<input type="button" name="sembilan" value=" 9 " OnClick="proses.Input.value += '9'">
<input type="button" name="nol" value=" 0 " OnClick="proses.Input.value += '0'">
<input type="button" name="hapus" value=" c " OnClick="proses.Input.value = ''">
<input type="button" name="hasil" value=" = " OnClick="proses.Input.value = eval(proses.Input.value)">
</td>
</tr>
</table>
</form>
</body>
</html>
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