public static List <Token> ConvertToPostfixToken(string expression)
{
int prioriy;
List <Token> tokens = Token.StringToTokens(expression);
List <Token> converted = new List <Token>(tokens.Count);
Stack <Token> stack = new Stack <Token>();
for (int i = 0; i < tokens.Count; i++)
{
Token current = tokens[i];
if (current.TokenType == Token.Type.OPERATOR &&
(current.CValue == '+' ||
current.CValue == '-' ||
current.CValue == '*' ||
current.CValue == '/'))
{
if (stack.Count <= 0)
{
stack.Push(current);
}
else
{
if (stack.Peek().CValue == '*' ||
stack.Peek().CValue == '/')
{
prioriy = 1;
}
else
{
prioriy = 0;
}
if (prioriy == 1)
{
if (current.CValue == '+' || current.CValue == '-')
{
converted.Add(stack.Pop());
i--;
}
else
{
converted.Add(stack.Pop());
i--;
}
}
else
{
if (current.CValue == '+' || current.CValue == '-')
{
converted.Add(stack.Pop());
stack.Push(current);
}
else
{
stack.Push(current);
}
}
}
}
else
{
converted.Add(current);
}
}
int len = stack.Count;
for (int j = 0; j < len; j++)
{
converted.Add(stack.Pop());
}
return(converted);
}
public static double EvaluateEquation(string eq)
{
List <Token> tokenized = Token.StringToTokens(eq);
Token equal = tokenized.Find(t => t.TokenType == Token.Type.EQUAL);
ReduceXDivision(tokenized);
int eqIndex = tokenized.IndexOf(equal);
Token[] left = new Token[eqIndex];
Token[] right = new Token[tokenized.Count - eqIndex - 1];
Array.Copy(tokenized.ToArray(), left, eqIndex);
Array.Copy(tokenized.ToArray(), eqIndex + 1, right, 0, tokenized.Count - eqIndex - 1);
List <Token> leftList = new List <Token>(left);
List <Token> rightList = new List <Token>(right);
Console.WriteLine("Left: ");
PrintTokens(leftList);
Console.WriteLine("Right: ");
PrintTokens(rightList);
while (leftList.FindAll(t => t.TokenType == Token.Type.X).Count > 1 || rightList.FindAll(t => t.TokenType == Token.Type.X).Count > 1)
{
ReduceX(leftList);
ReduceX(rightList);
}
MinusToPlus(leftList);
MinusToPlus(rightList);
ReduceNumbers(rightList);
ReduceNumbers(leftList);
Console.WriteLine("Left: ");
PrintTokens(leftList);
Console.WriteLine("Right: ");
PrintTokens(rightList);
int indexX = leftList.FindIndex(t => t.TokenType == Token.Type.X);
double a = indexX > 0 && leftList[indexX - 1].CValue == '*' ? leftList[indexX - 2].Value : indexX < 0 ? 0 : 1;
indexX = rightList.FindIndex(t => t.TokenType == Token.Type.X);
double c = indexX > 0 && rightList[indexX - 1].CValue == '*' ? rightList[indexX - 2].Value : indexX < 0 ? 0 : 1;
indexX = leftList.FindIndex(t => leftList.IndexOf(t) < leftList.Count - 1 && t.TokenType == Token.Type.NUMBER && leftList[leftList.IndexOf(t) + 1].CValue == '+');
if (indexX < 0)
{
if (leftList.Count == 1 && leftList[0].TokenType == Token.Type.NUMBER)
{
indexX = 0;
}
else
{
indexX = leftList.FindIndex(t => leftList.IndexOf(t) > 0 && t.TokenType == Token.Type.NUMBER && leftList[leftList.IndexOf(t) - 1].CValue == '+');
}
}
double b = indexX < 0 ? 0 : leftList[indexX].Value;
indexX = rightList.FindIndex(t => rightList.IndexOf(t) < rightList.Count - 1 && t.TokenType == Token.Type.NUMBER && rightList[rightList.IndexOf(t) + 1].CValue == '+');
if (indexX < 0)
{
if (rightList.Count == 1 && leftList[0].TokenType == Token.Type.NUMBER)
{
indexX = 0;
}
else
{
indexX = rightList.FindIndex(t => rightList.IndexOf(t) > 0 && t.TokenType == Token.Type.NUMBER && rightList[rightList.IndexOf(t) - 1].CValue == '+');
}
}
double d = indexX < 0 ? 0 : rightList[indexX].Value;
Console.WriteLine(a);
Console.WriteLine(c);
Console.WriteLine(b);
Console.WriteLine(d);
if (a - c == 0)
{
return(Double.NaN);
}
else if (d - b == 0)
{
return(Double.PositiveInfinity);
}
else
{
return((d - b) / (a - c));
}
}
