Translator – Adding Operators

Adding operator tokens will be handled by the separate function add_operator(). Some extra processing must be performed in addition to adding the token to the output list and pushing the output list's element pointer onto the done stack like is performed for simple operands.

Eventually this function will verify that the data types of operand(s) of the operator are the correct data type. Also for the case of operators taking two operands of the double data type, if either of the operands is an integer, then the special hidden CvtDbl operator must be inserted into the output list after the operand. This is the purpose of having the done stack and why it contains pointers to the output list elements. The pointers will be used to insert tokens after an element when necessary.

For now, the operands will simply be popped off of the done stack. For unary operators, only one operand is popped off of the done stack. This function will return the status of adding the operator, which will be an error or Good upon success.