The z/OS XL C Compiler and z/OS Language Environment C runtime library are designed to support the Programming languages - C (ISO/IEC 9899:1999) standard and its amendments. This standard is commonly referred to as C99. The z/OS XL C++ compiler is also designed to support the latest ISO C++ 2003 (Programming languages - C++ (ISO/IEC 14882:2003) ) standard and the latest technical corrigendum.
The compiler language additions for C99 do not apply to C++ applications because the C++ standard does not mandate support for C99.