void mathProcessor::processExpression (binaryTreeNode<string> *p){
	binaryTreeNode<string> *newNode;
	string temp;
	temp="";
	if(expression[position] == '('){
		newNode = new binaryTreeNode<string>;
		newNode->llink = NULL;
		newNode->rlink = NULL;
		p->llink = newNode;
		position ++;
		processExpression(p->llink);
	}
	if(isDigit(expression[position])){
		while(isDigit(expression[position])){
			temp += expression[position];
			position ++;
		}
		p->info = temp;
		temp = "";
		return;
	}
	if(isOperator(expression[position])){
		temp = expression[position];
		p->info = temp;
		binaryTreeNode<string> *newNode;
		temp = "";
		newNode->llink = NULL;
		newNode->rlink = NULL;
		position ++;
		processExpression(p->rlink);
	}
	if(expression[position] == ')'){
		position++;
         return;
            }
}