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public double EvalRPNString(string input) {
string[] tokens = input.Split(' ');
Stack<double> EvalStack = new Stack<double>();
double tmpNum = 0;
for (int i = 0; i < tokens.Length; i++) {
if (double.TryParse(tokens[i], out tmpNum)) {
EvalStack.Push(tmpNum);
} else {
try {
tmpNum = EvalStack.Pop();
switch (tokens[i]) {
case "+": {
EvalStack.Push(EvalStack.Pop() + tmpNum);
break;
}
case "-": {
EvalStack.Push(EvalStack.Pop() - tmpNum);
break;
}
case "*": {
EvalStack.Push(EvalStack.Pop() * tmpNum);
break;
}
case "/": {
EvalStack.Push(EvalStack.Pop() / tmpNum);
break;
}
case "^": {
EvalStack.Push(Math.Pow(EvalStack.Pop(), tmpNum));
break;
}
case "sqrt": {
EvalStack.Push(Math.Sqrt(tmpNum));
break;
}
case "sin": {
EvalStack.Push(Math.Sin(tmpNum));
break;
}
case "cos": {
EvalStack.Push(Math.Cos(tmpNum));
break;
}
case "tan": {
EvalStack.Push(Math.Tan(tmpNum));
break;
}
case "exp": {
EvalStack.Push(Math.Exp(tmpNum));
break;
}
case "log": {
EvalStack.Push(Math.Log(EvalStack.Pop(), tmpNum));
break;
}
}
} catch (InvalidOperationException ioe) {
Console.WriteLine("Fehler an Stelle {0}.", i + 1);
break;
}
}
}
if (EvalStack.Count > 1) {
Console.WriteLine("Stack nicht leer - fehlerhafter Inputstring");
return EvalStack.Pop();
} else {
try {
return EvalStack.Pop();
} catch (InvalidOperationException ioe) {
Console.WriteLine("Kein Ergebniss da ungültiger Inputstring");
return double.NaN;
}
}
}
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