Left and right single quotes are used to quote strings. The value of a quoted string is the string stripped of the quotes. Macro Processing When a macro name is recognized, its arguments are collected by searching for a matching right parenthesis. Macro evaluation proceeds normally during the collection of the arguments, and any commas or right parentheses that happen to turn up within the value of a nested call are as effective as those in the original input text. The size should be prime.
Macros take three slots, and non-macro arguments take one.
These macros may be redefined, but once this is done the original meaning is lost. Their values are NULL unless otherwise stated. The symbols may be up to five characters long. With no argu- ments, the comment mechanism is effectively disabled. With two arguments, both markers are affected.