Ich h&auml;tte gerne die Zahl in einem System mit <input type="text" id="blubb" value="2" onkeyup="javascript:var abc = this.value;if(!isNaN(parseFloat(abc)) && abc>1 && abc<11){durch=abc;document.getElementById('waszahl').innerHTML = 'Zahl im '+woerter[abc-2]+'system:';document.getElementById('waszahl2').innerHTML = 'Zahl im '+woerter[abc-2]+'system:';BtoD();DtoB();}" maxlength="2" size="1"> unterschiedlichen Ziffern.
<br>
<br>
<table border="0">
<tr>
<td>Dezimalzahl:</td>
<td><input type="text" value="123" id="zahl" onkeyup="DtoB();"></td>
</tr>
<tr>
<td id="waszahl">Zahl im Bin&auml;rsystem:</td>

<td><span id="bin">0</span></td>
</tr>
<tr>
<td><input type="button" value="Rechnung anzeigen" onclick="if(document.getElementById('wie').style.display == 'none'){document.getElementById('wie').style.display = ''; this.value='Rechnung nicht mehr anzeigen';}else{document.getElementById('wie').style.display = 'none'; this.value='Rechnung anzeigen';}"></td>
</tr>
<tr><td>&nbsp;</td><td>&nbsp;</td></tr>
<tr>
<td id="waszahl2">Zahl im Bin&auml;rsystem:</td>
<td><input type="text" value="10011010010" id="bzahl" onkeyup="BtoD();"></td>
</tr>
<tr>
<td>Dezimalzahl:</td>
<td><span id="dez">0</span></td>

</tr>
<tr>
<td><input type="button" value="Rechnung anzeigen" onclick="if(document.getElementById('wie2').style.display == 'none'){document.getElementById('wie2').style.display = ''; this.value='Rechnung nicht mehr anzeigen';}else{document.getElementById('wie2').style.display = 'none'; this.value='Rechnung anzeigen';}"></td>
</tr>
</table>
<br>
<table id="wie" border="0" style="font-style:italic;display:none;"></table>
<table id="wie2" border="0" style="display:none;"></table>
<script type="text/javascript">
var bins = "";
var zahl = 0;
var buffer, dezimal, malzahl, binaer, bin, dezimal2, tr, td1, td2, td3, td4, td5, td6, td7, td8, tdl;
var woerter = new Array("Binär", "Dreier", "Vierer", "Fünfer", "Sechser", "Siebener", "Achter", "Neuner", "Dezimal");
var durch = 2;

function umkehr(eingang)
{
buffer = "";
for(var i=1;i<=eingang.length;i++)
{
buffer += eingang[eingang.length-i];
}
return buffer;
}



function DtoB()
{
zahl = parseFloat(document.getElementById("zahl").value);
bins = "";
while(document.getElementById("wie").rows.length > 0)
{
document.getElementById("wie").deleteRow(0);
}
if(document.getElementById("zahl").value.replace(/\s/g, "") == "" || isNaN(zahl))
{
zahl = 0;
}
do
{
bin = zahl%durch;
bins += zahl%durch;
tr = document.createElement("tr");
td1 = document.createElement("td");
td2 = document.createElement("td");
td3 = document.createElement("td");
td4 = document.createElement("td");
td5 = document.createElement("td");
td6 = document.createElement("td");
td7 = document.createElement("td");
td8 = document.createElement("td");
tdl = document.createElement("td");
td1.innerHTML = "<font style='float:right;'>"+zahl+"</font>";
tr.appendChild(td1);
td2.innerHTML = ":";
tr.appendChild(td2);
td3.innerHTML = durch;
tr.appendChild(td3);
td4.innerHTML = "&nbsp;=&nbsp;";
tr.appendChild(td4);
zahl = Math.floor(zahl/durch);
td5.innerHTML = "<font style='float:right;'>"+zahl+"</font>";
tr.appendChild(td5);
td6.innerHTML = "-";
tr.appendChild(td6);
td7.innerHTML = "Rest <b><font style='font-style:normal;'>"+bin+"</font></b>";
tr.appendChild(td7);
tdl.innerHTML = "<font style='font-size:15px;>&nbsp;</font>";
tr.appendChild(tdl);
if(bins.length == 1 && zahl != 0)
{
td8.innerHTML = "<b><font style='font-style:normal;'>/\\</font></b>";
tr.appendChild(td8);
}
else if(bins.length != 1)
{
td8.innerHTML = "<b><font style='font-style:normal;'>|&nbsp;|</font></b>";
tr.appendChild(td8);
}
document.getElementById("wie").appendChild(tr);
} while(zahl != 0)
bins = umkehr(bins);
document.getElementById("bin").innerHTML = bins;
}







function BtoD()
{
while(document.getElementById("wie2").rows.length > 0)
{
document.getElementById("wie2").deleteRow(0);
}
zahl = document.getElementById("bzahl").value;
dezimal = 0;
malzahl = 1;
binaer = true;
if(document.getElementById("bzahl").value.replace(/\s/g, "") == "")
{
zahl = 0;
}

for(var i=0;i<zahl.length;i++)
{
if(parseFloat(zahl[i]) >= durch || parseFloat(zahl[i]) < 0)
{
 binaer = false;
 break;
}
}
if(binaer)
{
striche = "";
for(var i=1;i<=zahl.length;i++)
{
tr = document.createElement("tr");
td1 = document.createElement("td");
td2 = document.createElement("td");
td3 = document.createElement("td");
td4 = document.createElement("td");
td5 = document.createElement("td");
 td1.innerHTML = zahl[zahl.length-i];
 tr.appendChild(td1);
 td2.innerHTML = "*";
 tr.appendChild(td2);
 td3.innerHTML = "<font style='float:right;'>"+malzahl+"</font>";
 tr.appendChild(td3);
 td4.innerHTML = "&nbsp;=&nbsp;";
 tr.appendChild(td4);
 td5.innerHTML = "<font style='float:right;'>"+eval(malzahl*zahl[zahl.length-i])+"</font>";
 tr.appendChild(td5);
document.getElementById("wie2").appendChild(tr);
 dezimal += parseFloat(zahl[zahl.length-i])*malzahl;
 malzahl *= durch;
}
dezimal2 = dezimal+"";
for(var i=0;i<dezimal2.length;i+=2)
{
striche += "—";
}
tr = document.createElement("tr");
td1 = document.createElement("td");
td2 = document.createElement("td");
td3 = document.createElement("td");
td4 = document.createElement("td");
td5 = document.createElement("td");
 td1.innerHTML = "&nbsp;";
 tr.appendChild(td1);
 td2.innerHTML = "&nbsp;";
 tr.appendChild(td2);
 td3.innerHTML = "&nbsp;";
 tr.appendChild(td3);
 td4.innerHTML = "&nbsp;";
 tr.appendChild(td4);
 td5.innerHTML = "<font style='float:right;font-style:normal;'>"+striche+"</font>";
 tr.appendChild(td5);
document.getElementById("wie2").appendChild(tr);
tr = document.createElement("tr");
td1 = document.createElement("td");
td2 = document.createElement("td");
td3 = document.createElement("td");
td4 = document.createElement("td");
td5 = document.createElement("td");
 td1.innerHTML = "&nbsp;";
 tr.appendChild(td1);
 td2.innerHTML = "&nbsp;";
 tr.appendChild(td2);
 td3.innerHTML = "&nbsp;";
 tr.appendChild(td3);
 td4.innerHTML = "&nbsp;";
 tr.appendChild(td4);
 td5.innerHTML = "<font style='float:right;font-style:normal;'><b>"+dezimal+"</b></font>";
 tr.appendChild(td5);
document.getElementById("wie2").appendChild(tr);
document.getElementById("dez").innerHTML = dezimal;
}
else
{
document.getElementById("dez").innerHTML = "Das ist keine Zahl im "+woerter[durch-2]+"system ;)";
}
}
DtoB();
BtoD();
</script>