pragma in C language

Each implementation of C and C++ supports some features unique to its host machine or
operating system. Some programs, for instance, need to exercise precise control over the
memory areas where data is placed or to control the way certain functions receive
parameters. The #pragma directives offer a way for each compiler to offer machine- and
operating system-specific features while retaining overall compatibility with the C and
C++ languages. Pragmas are machine- or operating system-specific by definition, and are usually different for every compiler.