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─────C/C++ Language─────────────────────────────────────────────────────────
 
  Operator:  #
 
  Syntax:    #parameter
 
  Summary:   The stringizing operator, used only with the arguments
             of macros. If a # precedes a formal parameter in the
             definition of the macro, the actual argument is enclosed
             in double quotation marks and treated as a string when the
             macro is expanded. The resulting string is concatenated
             with adjacent strings. For example,
 
                  #define debug( x ) printf( #x " = %d\n", x )
 
             causes the statement
 
                  debug( width );
 
             to be expanded into
 
                  printf( "width = %d\n", width );
 
             White space between tokens in the actual argument is
             ignored. If the argument contains characters that normally
             must be preceded by a backslash (\) when appearing in a
             string (such as " or \), the backslash is automatically
             inserted.
                                    -♦-