Simple calculator

 <html>

<body>

        <div align="center">

        <h2>SIMPLE CALCULATOR</h2>

        <script type="text/javascript">

            a = ['1','2','3','+','4','5','6','-','7','8','9','*','C','0','=','/']

            z = '<td> <input type="button" value="'

            document.write('<form name="cal"><table><tr><td colspan="8"> <input type="text" name="get"></td></tr><tr>');

            for (var i = 0; i<16; i++) 

            {

                if(i==12)

                {

                    document.write('<td> <input type="reset" value="C" ></td>');

                    continue ;

                }

                if(i==14)

                {

                    document.write('<td> <input type="button" value="=" onclick="cal.get.value =eval(cal.get.value)"></td>');

                    continue ;

                }

                if(i==3||i==7||i==11)

                {

                    document.write(z+a[i]+'" onclick="cal.get.value +=\''+a[i]+'\'"></td></tr><tr  rowspan="2">');

                    continue ;

                }

                else

                    document.write(z+a[i]+'" onclick="cal.get.value +=\''+a[i]+'\'"></td>');

            }

            document.write('</table></form></div>');

        </script> 

</body> </html>


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