public string MakeOperation(string text, string typeOfOperation)
{
bool firstOperation = false;
if (!operationStack.Any())
{
previousValue = previousValue + Double.Parse(text);
numberStack.Push(previousValue);
firstOperation = true;
}
else
{
numberStack.Push(Double.Parse(text));
previousOperation = operationStack.Pop();
}
if (firstOperation == true)
{
operationStack.Push(typeOfOperation);
return(previousValue.ToString());
}
else
{
operationStack.Push(typeOfOperation);
}
switch (previousOperation)
{
case "+":
firstValueFromStack = numberStack.Pop();
secondValueFromStack = numberStack.Pop();
numberStack.Push(secondValueFromStack + firstValueFromStack);
return(numberStack.Peek().ToString());
case "-":
firstValueFromStack = numberStack.Pop();
secondValueFromStack = numberStack.Pop();
numberStack.Push(secondValueFromStack - firstValueFromStack);
return(numberStack.Peek().ToString());
case "*":
firstValueFromStack = numberStack.Pop();
secondValueFromStack = numberStack.Pop();
numberStack.Push(secondValueFromStack * firstValueFromStack);
return(numberStack.Peek().ToString());
case "/":
firstValueFromStack = numberStack.Pop();
secondValueFromStack = numberStack.Pop();
if (firstValueFromStack == 0)
{
return("Cannot divide by zero!");
}
else
{
numberStack.Push(secondValueFromStack / firstValueFromStack);
return(numberStack.Peek().ToString());
}
default:
return("0");
}
}