public static Double CalculateRPN(string rpnString, double[] values)
{
Stack <Double> numbersStack = new Stack <Double>();
Double value1, value2;
int pos = 0;
string variable = "";
for (int i = 0; i < rpnString.Length; i++)
{
if (SignChecker.isVariable(rpnString[i]))
{
variable += rpnString[i];
}
else if (rpnString[i] == ' ')
{
if (variable != "")
{
numbersStack.Push(int.Parse(variable));
}
variable = "";
}
else
{
if (variable != "")
{
numbersStack.Push(int.Parse(variable));
variable = "";
}
value2 = numbersStack.Pop();
value1 = numbersStack.Pop();
numbersStack.Push(SignChecker.useOperator(rpnString[i], value1, value2));
}
}
return(numbersStack.Pop());
}
//Calculating function
public static Double CalculateRPN(string rpnString, List <string> variables, double[] values)
{
Stack <Double> numbersStack = new Stack <Double>(); //stack for numbers
Double value1, value2; //first and second values
string variable = ""; //Current variable
//Replaces all variables from rpn string to variables values
for (int i = 0; i < variables.Count; i++)
{
rpnString = rpnString.Replace(variables[i], values[i].ToString());
}
for (int i = 0; i < rpnString.Length; i++)
{
//If current symbol is variable
if (SignChecker.isVariable(rpnString[i]))
{
//Add to variable
variable += rpnString[i];
}
else if (rpnString[i] == ' ')
{
//If current symbol is space and we have something in variable
if (variable != "")
{
//Add variable to stack
numbersStack.Push(double.Parse(variable));
}
variable = "";
}
else if (rpnString[i] == '-' && i != rpnString.Length - 1 && SignChecker.isVariable(rpnString[i + 1]))
{
variable += rpnString[i];
}
else
{
//If variable has something
if (variable != "")
{
//Add to stack
numbersStack.Push(double.Parse(variable));
variable = "";
}
//Take two values from stack
value2 = numbersStack.Pop();
value1 = numbersStack.Pop();
//Calculate them
numbersStack.Push(SignChecker.useOperator(rpnString[i], value1, value2));
}
}
if (variable != "")
{
numbersStack.Push(double.Parse(variable));
}
return(numbersStack.Pop());
}
