Javarechner

Dieser Taschenrechner funktioniert etwas anders, als wie man es von herkömmlichen Taschenrechnern kennt. Nach Eingabe der ersten Ziffer klickt man auf die "ENTER" Taste. Die Zahl erscheint nun im Speicher. Als nächstes gibt man die zweite Zahl ein. Danach klickt man auf eine der Operratortasten (+,-,x,/). Das Ergebnis erscheint nun in der unteren Zeile.

Quelltext für Einbindung in die Web-Seite (zwischen den BODY-Tag's):



<FORM METHOD="post">
<SCRIPT LANGUAGE="JavaScript">
<!-- Hide JavaScript from Java-Impaired Browsers
      //

var computed = false

function pushStack(form)
{
    form.stack.value = form.display.value
    form.display.value = 0
}

function addChar(input, character)
{
    if(computed) {
        pushStack(input.form)
        computed = false
    }


    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 add(form)
{
    form.display.value = parseFloat(form.stack.value)
                       + parseFloat(form.display.value)
    computed = true
}

function subtract(form)
{
    form.display.value = form.stack.value - form.display.value
    computed = true
}

function multiply(form)
{
    form.display.value = form.stack.value * form.display.value
    computed = true
}

function divide(form)
{
    var divisor = parseFloat(form.display.value)
    if(divisor == 0) {
        alert("Division durch Null nicht möglich !");
        return
    }
    form.display.value = form.stack.value / divisor
    computed = true
}

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
}
// Old browser hide ends ---------->

</SCRIPT>
<!-- Tabelle für Rechner -->
<center>
<TABLE bgcolor=#66CCCC BORDER=8  bordercolordark=#000099 bordercolorlight=#0000FF COLS=2  >
<TR ALIGN=CENTER>
<TD COLSPAN="4">
<TABLE BORDER=0 >
<TR>
<TD ALIGN=RIGHT>Speicher:</TD>

<TD><INPUT NAME="stack" VALUE="0"></TD>
</TR>

<TR>
<TD ALIGN=RIGHT> </TD>

<TD><INPUT NAME="display" VALUE="0"></TD>
</TR>
</TABLE>
 </TD>
</TR>

<TR ALIGN=CENTER>
<TD><INPUT TYPE="button" VALUE=" 7 " ONCLICK="addChar(this.form.display,
'7')"></TD>

<TD><INPUT TYPE="button" VALUE=" 8 " ONCLICK="addChar(this.form.display,
'8')"></TD>

<TD><INPUT TYPE="button" VALUE=" 9 " ONCLICK="addChar(this.form.display,
'9')"></TD>

<TD><INPUT TYPE="button" VALUE=" ÷ " ONCLICK="divide(this.form)"></TD>
</TR>

<TR ALIGN=CENTER>
<TD><INPUT TYPE="button" VALUE=" 4 " ONCLICK="addChar(this.form.display,
'4')"></TD>

<TD><INPUT TYPE="button" VALUE=" 5 " ONCLICK="addChar(this.form.display,
'5')"></TD>

<TD><INPUT TYPE="button" VALUE=" 6 " ONCLICK="addChar(this.form.display,
'6')"></TD>

<TD><INPUT TYPE="button" VALUE=" x " ONCLICK="multiply(this.form)"></TD>
</TR>

<TR ALIGN=CENTER>
<TD><INPUT TYPE="button" VALUE=" 1 " ONCLICK="addChar(this.form.display,
'1')"></TD>

<TD><INPUT TYPE="button" VALUE=" 2 " ONCLICK="addChar(this.form.display,
'2')"></TD>

<TD><INPUT TYPE="button" VALUE=" 3 " ONCLICK="addChar(this.form.display,
'3')"></TD>

<TD><INPUT TYPE="button" VALUE=" - " ONCLICK="subtract(this.form)"></TD>
</TR>

<TR ALIGN=CENTER>
<TD><INPUT TYPE="button" VALUE=" 0 " ONCLICK="addChar(this.form.display,
'0')"></TD>

<TD><INPUT TYPE="button" VALUE=" . " ONCLICK="addChar(this.form.display,
'.')"></TD>

<TD><INPUT TYPE="button" VALUE="+/-" ONCLICK="changeSign(this.form.display)"></TD>

<TD><INPUT TYPE="button" VALUE=" + " ONCLICK="add(this.form)"></TD>
</TR>

<TR ALIGN=CENTER>
<TD COLSPAN="2"><INPUT TYPE="button" VALUE=" Enter " NAME="enter"
ONCLICK="pushStack(this.form)"></TD>

<TD><INPUT TYPE="button" VALUE=" C " ONCLICK="this.form.display.value = 0 "></TD>

<TD><INPUT TYPE="button" VALUE=" <- " ONCLICK="deleteChar(this.form.display)"></TD>
</TR>
</TABLE>
</FORM> 
</center>
<DIV CLASS="GeoBranding" ID="GeoBranding" STYLE="position:absolute;top:1;visibility:hide;">
</DIV>
<SCRIPT LANGUAGE="javascript1.2" SRC="/include/branding/default_ns.js">
</SCRIPT>