Modules - Interface Declaration

It is good practice (and often mandatory) to declare procedure interfaces in any program unit invoking the corresponding procedure, however, in a single executable program there will be:

• a large number of procedures;
• a large amount of duplicated interface declarations with great opportunity for mismatch;

by placing all interface declarations in a MODULE the above problems become more tractable; the interfaces will be visible wherever the module is used. This method allows the interface to be declared just once (in the module) thereby almost eliminating the scope for typos and mismatches. It also has the advantage of collecting all the interfaces together which is a handy reference during coding.

• Modules Interface Declaration Example