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<html> <head>
<meta charset="utf-8">
<style>
button{width:50px}
input{width:200px;font-family:mono}
#rechnung{}
#ergebnis{}
iframe{background:none;}
</style>
<script>
var result="";
function addtoterm(charx){
document.getElementById('rechnung').value+=charx;
}
function reset(){
document.getElementById('rechnung').value="";
document.getElementById('ergebnis').value="";
}
function deletec(){
var oldn=document.getElementById('rechnung').value;
var newn=oldn.slice(0,oldn.length-1);
document.getElementById('rechnung').value=newn;
}
function calculate(){
var term=document.getElementById('rechnung').value;
term=term.replace(/x/,'*');
term=term.replace(/:/,'/');
result=eval(term);
if(result===NaN){
result="Mathematisch Inkorrekt";
document.getElementById('ergebnis').value=result;
result="";
}
else if(result===undefined){
result="Nicht Definiert";
document.getElementById('ergebnis').value=result;
result="";
}
else{
document.getElementById('ergebnis').value=result;
}
}
</script>
</head>
<body>
<input type="text"readonly id="rechnung"><br>
<input type="text"readonly id="ergebnis"><br>
<button onclick="addtoterm(1)">1</button><button onclick="addtoterm(2)">2</button><button onclick="addtoterm(3)">3</button><button onclick='addtoterm(":")'>:</button><br>
<button onclick="addtoterm(4)">4</button><button onclick="addtoterm(5)">5</button><button onclick="addtoterm(6)">6</button><button onclick='addtoterm("x")'>x</button><br>
<button onclick="addtoterm(7)">7</button><button onclick="addtoterm(8)">8</button><button onclick="addtoterm(9)">9</button><button onclick='addtoterm("-")'>-</button><br>
<button onclick="addtoterm(0)">0</button><button onclick='addtoterm("(")'>(</button><button onclick='addtoterm(")")'>)</button><button onclick='addtoterm("+")'>+</button><br>
<button onclick="deletec()">del</button><button onclick="reset()">AC</button><button onclick="addtoterm(result)">Ans</button><button onclick="calculate()">=</button><br>
</body>
</html>
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