Coding hints and tips

Do not use EXEC CICS commands in macros.
Do not use EXEC CICS commands in header files. This makes the translation process much simpler.
Do not set atexit() routines before an EXEC CICS XCTL. You will get unpredictable results.
If you call fclose() or freopen() for a standard stream, you cannot redirect or reopen the link to the transient data queue. z/OS® XL C/C++ does not provide a method of opening or reopening the transient data queues.
The actual transient data queue is not closed when you call fclose() or freopen() for a standard stream; however, the transaction will lose access to the stream.
You should not use the stdin stream unless you are redirecting it from a memory file.
Closing the cout, cerr, or clog standard streams in a C++ application has the same effect as closing stdout or stderr.
When CICS handlers (using EXEC CICS HANDLE ABEND PROG) are activated along with C or C++ signal handlers, the CICS handler is invoked when an abend occurs. The C or C++ signal handler that corresponds to that class of abends is ignored.
Note: The handler mentioned here is not a catch clause. It is a C signal handler exception registered by a C++ routine.
If you do an EXEC CICS RETURN out of an atexit() routine, the resulting return code (RESP2) is undefined.