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An Overview of Preprocessor Directives

    A few general rules govern the use of preprocessor directives:

         Preprocessor directives are introduced by the # character. The #
         must be the first non-white-space character on the line.

         Blanks and tabs may not appear between the # and the directive
         name.

         Directives have file scope--they apply from the point at which
         they first appear, to the end of the source file.

         Unlike C statements, preprocessor directives do not require a
         terminating semicolon.

         The directive consisting of a # only, supported by many
         compilers, is not supported by MS-C compiler.

         The compile-time switches /P, /E and /EP save the output
         produced by the preprocessor. The /C option allows comments to
         be retained.