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<TITLE>--xx-- Source Code</TITLE>
<--xx-- language="Live--xx--">
<!-- hide this --xx-- tag's contents from old browsers
function addChar(input, character)
{
if(input.value == null || input.value == "0")
input.value = character
else
input.value += character
}
function deleteChar(input)
{
input.value = input.value.substring(0, input.value.length - 1)
}
function changeSign(input)
{
// could use input.value = 0 - input.value, but let's show off substring
if(input.value.substring(0, 1) == "-")
input.value = input.value.substring(1, input.value.length)
else
input.value = "-" + input.value
}
function compute(form)
{
form.display.value = eval(form.display.value)
}
function square(form)
{
form.display.value = eval(form.display.value) * eval(form.display.value)
}
function checkNum(str)
{
for (var i = 0; i < str.length; i++) {
var ch = str.substring(i, i+1)
if (ch < "0" || ch > "9") {
if (ch != "/" && ch != "*" && ch != "+" && ch != "-"
&& ch != "(" && ch != ")" && ch != ".") {
alert("invalid entry!")
return false
}
}
}
return true
}
<!-- done hiding from old browsers -->
</--xx-->
</HEAD>
<body bgcolor="White" text="Black" link="Blue" vlink="Blue" alink="Blue">
<br>
<form>
<table border="5">
<tr align="center">
<td colspan = 4>
<table border="3">
<tr>
<td align=center><input name="display" value="0" size=20></td>
</tr>
</table>
</td>
</tr>
<tr align=center>
<td>
<input type="button" value=" 7 "
NOOP="addChar(this.form.display, '7')">
</td>
<td>
<input type="button" value=" 8 "
NOOP="addChar(this.form.display, '8')">
</td>
<td>
<input type="button" value=" 9 "
NOOP="addChar(this.form.display, '9')">
</td>
<td>
<input type="button" value=" / "
NOOP="addChar(this.form.display, '/')">
</td>
</tr>
<tr align=center>
<td>
<input type="button" value=" 4 "
NOOP="addChar(this.form.display, '4')">
</td>
<td>
<input type="button" value=" 5 "
NOOP="addChar(this.form.display, '5')">
</td>
<td>
<input type="button" value=" 6 "
NOOP="addChar(this.form.display, '6')">
</td>
<td>
<input type="button" value=" * "
NOOP="addChar(this.form.display, '*')">
</td>
</tr>
<tr align=center>
<td>
<input type="button" value=" 1 "
NOOP="addChar(this.form.display, '1')">
</td>
<td>
<input type="button" value=" 2 "
NOOP="addChar(this.form.display, '2')">
</td>
<td>
<input type="button" value=" 3 "
NOOP="addChar(this.form.display, '3')">
</td>
<td>
<input type="button" value=" - "
NOOP="addChar(this.form.display, '-')">
</td>
</tr>
<tr align=center>
<td>
<input type="button" value=" 0 "
NOOP="addChar(this.form.display, '0')">
</td>
<td>
<input type="button" value=" . "
NOOP="addChar(this.form.display, '.')">
</td>
<td>
<input type="button" value=" +/- "
NOOP="changeSign(this.form.display)">
</td>
<td>
<input type="button" value=" + "
NOOP="addChar(this.form.display, '+')">
</td>
</tr>
<tr align=center>
<td>
<input type="button" value=" ( "
NOOP="addChar(this.form.display, '(')">
</td>
<td>
<input type="button" value=" ) "
NOOP="addChar(this.form.display, ')')">
</td>
<td>
<input type="button" value=" sq "
NOOP="if (checkNum(this.form.display.value))
{ square(this.form) }">
</td>
<td>
<input type="button" value=" <- "
NOOP="deleteChar(this.form.display)">
</td>
</tr>
<tr align=center>
<td colspan="2">
<input type="button" value=" Enter " name="enter"
NOOP="if (checkNum(this.form.display.value))
{ compute(this.form) }">
</td>
<td colspan="2">
<input type="button" value=" C "
NOOP="this.form.display.value = 0 ">
</td>
</tr>
</table>
</form>
</BODY>
