How to use the open parenthesis as a value for a macro variable?

[zhijun]

Why I can not run the macro as below, but if I set other special value like decimal  for the varibale CHAR, it will work. Do you have any suggestion if i want to scussfully run the code below, thank you.

%macro align1(char= ) ;

%put this is  &char  ;

%mend ;

%align1(char=%nrstr( ( )   )    ;

[Kurt_Bremser · Accepted solution]

You just need a slight modification at invocation:

%align1(char=%str(%());

[zhijun]

Thanks for your answer, this is exactly what I want.