كود الة حاسبة

<script>
function compute(obj)
  {obj.expr.value = eval(obj.expr.value)}
var one = '1'
var two = '2'
var three = '3'
var four = '4'
var five = '5'
var six = '6'
var seven = '7'
var eight = '8'
var nine = '9'
var zero = '0'
var plus = '+'
var minus = '-'
var multiply = '*'
var divide = '/'
var decimal = '.'
function enter(obj, string)
  {obj.expr.value += string}
function clear(obj)
  {obj.expr.value = ''}
</script>

<p align="center"><font color="#000000" size="3"
face="Verdana, Arial, Helvetica, sans-serif"><strong></strong></font><strong> </strong></p>

<form name="calc">
    <div align="center"><center><table border="1"
    bgcolor="#FFEAFF">
        <tr>
            <td colspan="4"><input type="text" size="30"
            name="expr" action="compute(this.form)"> </td>
        </tr>
        <tr>
            <td><p align="center"><input type="button"
            value="  7  " onclick="enter(this.form, seven)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  8  " onclick="enter(this.form, eight)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  9  " onclick="enter(this.form, nine)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  /  " onclick="enter(this.form, divide)"> </p>
            </td>
        </tr>
        <tr>
            <td><p align="center"><input type="button"
            value="  4  " onclick="enter(this.form, four)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  5  " onclick="enter(this.form, five)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  6  " onclick="enter(this.form, six)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  *  " onclick="enter(this.form, multiply)"> </p>
            </td>
        </tr>
        <tr>
            <td><p align="center"><input type="button"
            value="  1  " onclick="enter(this.form, one)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  2  " onclick="enter(this.form, two)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  3  " onclick="enter(this.form, three)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  -  " onclick="enter(this.form, minus)"> </p>
            </td>
        </tr>
        <tr>
            <td colspan="2"><p align="center"><input
            type="button" value="      0      "
            onclick="enter(this.form, zero)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  .  " onclick="enter(this.form, decimal)"> </p>
            </td>
            <td><p align="center"><input type="button"
            value="  +  " onclick="enter(this.form, plus)"> </p>
            </td>
        </tr>
        <tr>
            <td colspan="2"><p align="center"><input
            type="button" value="  =  "
            onclick="compute(this.form)"> </p>
            </td>
            <td colspan="2"><p align="center"><input type="reset"
            value="AC" onclick="clear(this.form)"> </p>
            </td>
        </tr>
    </table>
    </center></div>
</form>

<p align="center"> </p>

<p align="center"><a
<p align="center">  </p>

<p> </p>
</body>
</html>