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Samstag, 14. Mai 2011
Taschenrechner
<html>
<head>
<title>Taschenrechner</title>
<script type="text/javascript">
function Check (Eingabe) {
var nur_das = "0123456789[]()-+*%/.";
for (var i = 0; i < Eingabe.length; i++)
if (nur_das.indexOf(Eingabe.charAt(i)) < 0)
return false;
return true;
}
function Ergebnis () {
var x = 0;
if (Check(window.document.Rechner.Display.value))
x = eval(window.document.Rechner.Display.value);
window.document.Rechner.Display.value = x;
}
function Hinzufuegen (Zeichen) {
window.document.Rechner.Display.value = window.document.Rechner.Display.value + Zeichen;
}
function Sonderfunktion (Funktion) {
if (Check(window.document.Rechner.Display.value)) {
if (Funktion == "sqrt") {
var x = 0;
x = eval(window.document.Rechner.Display.value);
window.document.Rechner.Display.value = Math.sqrt(x);
}
if (Funktion == "pow") {
var x = 0;
x = eval(window.document.Rechner.Display.value);
window.document.Rechner.Display.value = x * x;
}
if (Funktion == "ln") {
var x = 0;
x = eval(window.document.Rechner.Display.value);
window.document.Rechner.Display.value = Math.log(x);
}
} else
window.document.Rechner.Display.value = 0}
</script>
<style type="text/css">
.button { width:60px; text-align:center;
font-family:System,sans-serif;
font-size:100%; }
.display { width:100%; text-align:right;
font-family:System,sans-serif;
font-size:100%; }
</style>
</head>
<body bgcolor="#FFFFE0">
<form name="Rechner" action="" onsubmit="Ergebnis();return false;">
<table border="5" cellpadding="10" cellspacing="0">
<tr>
<td bgcolor="#C0C0C0">
<input type="text" name="Display" align="right" class="display"></td>
</tr><tr>
<td bgcolor="#E0E0E0">
<table border="0" cellpadding="0" cellspacing="2">
<tr>
<td><input type="button" width="60" class="button" value=" 7 " onclick="Hinzufuegen('7')"></td>
<td><input type="button" width="60" class="button" value=" 8 " onclick="Hinzufuegen('8')"></td>
<td><input type="button" width="60" class="button" value=" 9 " onclick="Hinzufuegen('9')"></td>
<td><input type="button" width="60" class="button" value=" + " onclick="Hinzufuegen('+')"></td>
</tr>
<tr>
<td><input type="button" width="60" class="button" value=" 4 " onclick="Hinzufuegen('4')"></td>
<td><input type="button" width="60" class="button" value=" 5 " onclick="Hinzufuegen('5')"></td>
<td><input type="button" width="60" class="button" value=" 6 " onclick="Hinzufuegen('6')"></td>
<td><input type="button" width="60" class="button" value=" - " onclick="Hinzufuegen('-')"></td>
</tr>
<tr>
<td><input type="button" width="60" class="button" value=" 1 " onclick="Hinzufuegen('1')"></td>
<td><input type="button" width="60" class="button" value=" 2 " onclick="Hinzufuegen('2')"></td>
<td><input type="button" width="60" class="button" value=" 3 " onclick="Hinzufuegen('3')"></td>
<td><input type="button" width="60" class="button" value=" * " onclick="Hinzufuegen('*')"></td>
</tr>
<tr>
<td><input type="button" width="60" class="button" value=" 0 " onclick="Hinzufuegen('0')"></td>
<td><input type="button" width="60" class="button" value=" . " onclick="Hinzufuegen('.')"></td>
<td><input type="button" width="60" class="button" value=" = " onclick="Ergebnis()"></td>
<td><input type="button" width="60" class="button" value=" / " onclick="Hinzufuegen('/')"></td>
</tr>
<tr>
<td><input type="button" width="60" class="button" value="sqrt " onclick="Sonderfunktion('sqrt')"></td>
<td><input type="button" width="60" class="button" value=" pow " onclick="Sonderfunktion('pow')"></td>
<td><input type="button" width="60" class="button" value=" ln " onclick="Sonderfunktion('ln')"></td>
<td><input type="reset" width="60" class="button" value=" C "></td>
</tr>
</table>
</td></tr></table>
</form>
</body>
</html>
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