Alright. The program's function is to compile the checksum of a given string of characters that ends in a . , print the checksum in both character and integer form, and then my problem comes in that I want the program to prompt another input up until only a period is inserted. Currently my program just calculates the checksum once, then ends. Ideally it would calculate multiple checksums without having to be re-executed. I hope that wording makes more sense.

As far doing the #include for the function check_sum... I'm using the vim editor in linux, and in this editor all that is required is the function prototype (which i have just under #define END_CHAR) and then it can be referenced at any time within the main driver. I've never actually seen a script using #include, but it may work just the same.

Does this make more sense?