/// <summary>
/// Calculator
/// </summary>
/// <param name="reader"></param>
/// <param name="writer"></param>
public static void Calculator(TextReader reader, TextWriter writer)
{
//TODO: more info here
int i1;
IStack stack = new StackAsLinkedList();
while ((i1 = reader.Read()) > 0)
{
char ch = (char)i1;
if (Char.IsDigit(ch))
{
stack.Push((ch - '0'));
}
else if (ch == '+')
{
int j1 = (int)stack.Pop();
int k1 = (int)stack.Pop();
stack.Push((k1 + j1));
}
else if (ch == '*')
{
int i2 = (int)stack.Pop();
int j2 = (int)stack.Pop();
stack.Push((j2 * i2));
}
else if (ch == '=')
{
int k2 = (int)stack.Pop();
writer.WriteLine(k2);
}
}
}
/// <summary>
/// Constructor, internal
/// </summary>
/// <param name="stack"></param>
internal Enumerator(StackAsLinkedList stack)
{
position = null;
this.stack = stack;
}