private static void PopStack(LStack stack, LStack postfix)
{
postfix.Push(stack.Top());
stack.Pop();
stack.Push(ch);
Console.WriteLine("");
Calculate(stack, postfix);
}
private static void PushStack(LStack stack, LStack postfix)
{
stack.Push(ch);
Calculate(stack, postfix);
}
static void Main(string[] args)
{
// For Operator
LStack stack = new LStack();
// For Operand
LStack postfix = new LStack();
Console.WriteLine("Enter word 'enter' to finish");
Console.WriteLine("Enter Operand and Operator to calculate");
while (true)
{
Console.Write("\n\nEnter : ");
ch = Console.ReadLine();
CheckOperatorInput();
// Input is Operand then push to stack
if (!isOperator)
{
if (ch.Length == 1)
{
postfix.Push(ch);
Calculate(stack, postfix);
}
}
// Input is Operator
else if (isOperator)
{
// If Stack is empty then push to stack
if (stack.m_head == null)
{
PushStack(stack, postfix);
}
// If Stack isn't empty then check operator
else
{
if (ch == "*" || ch == "/")
{
// Input <= stack.top
if (stack.Top() == "*" || stack.Top() == "/")
{
PopStack(stack, postfix);
}
// Input > stack.top
else if (stack.Top() == "+" || stack.Top() == "-" || stack.Top() == "(" || stack.Top() == ")")
{
PushStack(stack, postfix);
}
}
else if (ch == "+" || ch == "-")
{
// Input <= stack.top
if (stack.Top() == "+" || stack.Top() == "-" || stack.Top() == "*" || stack.Top() == "/")
{
PopStack(stack, postfix);
}
// Input > stack.top
if (stack.Top() == "(" || stack.Top() == ")")
{
PushStack(stack, postfix);
}
}
else if (ch == "(")
{
PushStack(stack, postfix);
}
else if (ch == ")")
{
// Pop stack until found " ( " not push " ) " to stack
for (int i = 0; i <= stack.m_count; i++)
{
if (stack.Top() != "(")
{
postfix.Push(stack.Top());
stack.Pop();
Console.WriteLine("");
Calculate(stack, postfix);
}
else if (stack.Top() == "(")
{
stack.Pop();
break;
}
}
}
}
}
// Enter for result
if (ch == "enter" || ch == "Enter")
{
for (int i = 0; i <= stack.m_count; i++)
{
if (stack.m_head != null)
{
postfix.Push(stack.Top());
stack.Pop();
Console.WriteLine("");
Calculate(stack, postfix);
}
}
Result(postfix);
break;
}
}
Console.ReadLine();
}