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Constructor for postfix string expression
arithmetic_expression::arithmetic_expression(RPNstring input)
{


}

Tree::Tree(std::string input,Tree *leftSubTree,Tree *rightSubTree){
  Op = input;
  leftPtr = leftSubTree;
  rightPtr = rightSubTree;
  int num;
  if (input == "+"|input == "-"|input == "*"|input == "/")
    NodeType = TYPE_OPERATOR;
  else if(std::istringstream(Op)>>num)
    NodeType = TYPE_NUMBER;
  else
    NodeType = TYPE_VARIABLE;
}