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  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 quotes 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.
                                    -♦-