In order to spread Unicode in big cross platform projects using C/C++ languages we find that UTF-16 support in C/C++ languages need to be discussed. We have implemented syntax extension to C/C++ functions to handle Unicode in C/C++ compiler and libraries without using wchar_t. We have also made a compiler based tool in order to support Unicode-Porting of existing large cross platform C/C++ programs. We would like to discuss the Unicode Standard 3.0 book, 5.2 implementation guide lines from the technical point of the view, also considering memory consumption and performance. We take the current C89/C99 in consider and would like to present our implementation as one of the possibilities to ease Unicode distribution also in the C/C++ cross platform world. Our implementation is focused on UTF-16 and is also interesting when comparing advantage and disadvantages between Asian character sets and Unicode.