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In the FORTRAN 77 programming language, a character constant consists of an
apostrophe followed by any string of characters followed by an apostrophe.
 The apostrophes are not part of the datum.  If an apostrophe is to appear
as part of the datum it must be followed immediately by another apostrophe.
Note that blanks are significant.  The length of the character constant is
the number of characters appearing between the delimiting apostrophes.
 Consecutive apostrophes in a character datum represent one character,
namely the apostrophe.  A character constant must not have length 0.

The following are examples of character constants.


     'ABCDEFG1234567'
     'There''s always tomorrow'

The FORTRAN form of a character constant will be accepted when the
debugger's currently established language is FORTRAN.