syntax - Why c functions can be defined this way? -

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possible duplicates:
what useful c syntax?
what strange function definition syntax in c? 

static void add_shopt_to_alist (opt, on_or_off)      char *opt;      int on_or_off; { ... }

what's syntax :

(opt, on_or_off)          char *opt;          int on_or_off;

?


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