Before you can run a program, you must define it in the CICS CSD. When defining a program to CICS, you should use LANGUAGE(LE). However, if the program is in C and does not use ILC support, you can use LANGUAGE(C).
If you use a copy of a reentrant C or C++ application program that was installed in the link pack area, you must specify USELPACOPY(YES) in the resource definition when you define the program in the CSD. You can use the CICS-supplied procedure DFYEITDL to translate, compile, prelink, and link-edit C or C++ programs. For C programs, you may have to change the compile step of this procedure. You will have to change the compile step to use it with the C++ compiler.