#if defined _MSC_VER
printf( " This is Microsoft 'C'" );

#elif defined __GNUC__
printf( " This is GCC" );

#elif defined __BORLANDC__
printf( " This is Borland C" );

#elif defined _CC51 
printf( " This is the Tasking 8051 Compiler" );

#elif defined __C51__ 
printf( " This is the Keil C51 Compiler " );

#else
#error Unsupported Compiler!
#endif