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(g77-295.info)Character Type

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Character Type
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   (Corresponds to Section 4.8 of ANSI X3.9-1978 FORTRAN 77.)

   A character constant may be delimited by a pair of double quotes
(`"') instead of apostrophes.  In this case, an apostrophe within the
constant represents a single apostrophe, while a double quote is
represented in the source text of the constant by two consecutive double
quotes with no intervening spaces.

   A character constant may be empty (have a length of zero).

   A character constant may include a substring specification, The
value of such a constant is the value of the substring--for example,
the value of `'hello'(3:5)' is the same as the value of `'llo''.