Modular programming in Delphi is implemented by handling two types of routines (or methods): procedures and functions. The two types have many similarities and one difference; functions return a value to the point of call. The idea is that the code uses this value to proceed with the algorithm it implements. Procedures just execute the code. This is the rule; however, as we will see, there is a way to use procedures to modify values at the point of call.
Declaration
In practice, this difference may become blurry as you can call a function and just ignore the return value, and, as a matter ...
