INCLUDEs in C

INCLUDEs in the C language are basically the same as in PL/I except note the following:

The SQLCA is always automatically generated, so no INCLUDE should be used for it. However, you must code your own SQLDA and SQLVAR when using dynamic SQL.
The EXEC SQL INCLUDE <member name>; SQL statement can be used to include members from the PDS data set INCLUDE in z/OS (for z/VSE, the name in the EXEC SQL INCLUDE is the name of a member in a z/VSE library). INCLUDEs in C cannot be nested.
Because the Precompiler executes before the C Preprocessor, statements such as #include, #define, and typedef are not expanded. Unless the user executes the language preprocessor only before the CA Datacom/SQL C Preprocessor, host variables in #include files cannot be referenced, and #define and typedefs cannot be used to declare a host variable data type.