On Tue, Oct 21, 2008 at 2:03 PM, Ruini Xue <[EMAIL PROTECTED]> wrote: > Hans Hagen <pragma <at> wxs.nl> writes: > >> >> Ruini Xue wrote: >> > It's difficult to understand them from the code. >> >> the first one issues a warning when no argument is given > > You mean both of them ask the following \command to take two mandatory > arguments? I try this example: > > ====================================== > \def\test > {\dodoubleargument\dotest} % use \dodoubleempty > > \def\dotest[#1][#2]
You need a comment sign at the end of the line. \def\dotest[#1][#2]% > {\iffirstargument > First arg: #1 > \fi > \ifsecondargument > Second arg: #2 > \fi} > > \test[ok][ok] % 1. this is ok > > \test [ok] [] % 2. warning? This is just a empty argument. > \test [wrong] % 3. Error: lack one arg > ================================== > > both 1 and 2 can print "First arg" and "Second arg", so I am confused what's > "no argument is given" Wolfgang ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________