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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