10.1.2 Procedure statements

Procedure statements are calls to subroutines. There are dierent possibilities for procedure calls:

All types are present in the following diagram:

_________________________________________________________________________________________________________Procedure statements
-- --procedure statement-|---procedure identi  er---|--------------------
                      ||---method identi  er---||-actual parameter list-|
                       -quali  ed method identi  er
                       ----variable reference-----
___________________________________________________________________

The Free Pascal compiler will look for a procedure with the same name as given in the procedure statement, and with a declared parameter list that matches the actual parameter list. The following are valid procedure statements:

Usage;  
WriteLn('Pascal is an easy language !');  
Doit();

Remark: When looking for a function that matches the parameter list of the call, the parameter types should be assignment-compatible for value and const parameters, and should match exactly for parameters that are passed by reference.