private bool ContinueCompareOperators(ListStack <char> stack, char current)
{
if (stack.IsEmpty())
{
return(false);
}
return(CompareOperators(stack.Peek(), current) >= 0);
}
public string GetPostFix(string inFix)
{
ListStack <char> stack = new ListStack <char>();
char[] postFixArray = new char[inFix.Length];
int index = 0;
for (var i = 0; i < inFix.Length; i = i + 1)
{
char current = inFix[i];
if (char.IsNumber(current))
{
postFixArray[index++] = current;
continue;
}
if (current == '(')
{
stack.Push(current);
continue;
}
if (current == ')')
{
while (true)
{
char temp = stack.Pop();
if (temp == '(')
{
break;
}
postFixArray[index++] = temp;
}
continue;
}
while (ContinueCompareOperators(stack, current))
{
stack.Pop();
postFixArray[index++] = stack.CurrentData;
}
stack.Push(current);
}
while (!stack.IsEmpty())
{
stack.Pop();
postFixArray[index++] = stack.CurrentData;
}
return(new string(postFixArray).Replace('\0', ' ').Trim());
}
public int CalculatePostFix(string postFixForm)
{
ListStack <int> stack = new ListStack <int>();
foreach (var current in postFixForm)
{
if (char.IsDigit(current))
{
stack.Push(int.Parse(current.ToString()));
continue;
}
int right = stack.Pop();
int left = stack.Pop();
int result = Calculate(left, current, right);
stack.Push(result);
}
return(stack.Pop());
}
