(g77.info) Lines

(g77.info) Characters Lines Sequence
 
 Lines
 -----
 
    (Corresponds to Section 3.2 of ANSI X3.9-1978 FORTRAN 77.)
 
    The way a Fortran compiler views source files depends entirely on the
 implementation choices made for the compiler, since those choices are
 explicitly left to the implementation by the published Fortran
 standards.
 
    The GNU Fortran language mandates a view applicable to UNIX-like
 text files--files that are made up of an arbitrary number of lines,
 each with an arbitrary number of characters (sometimes called
 stream-based files).
 
    This view does not apply to types of files that are specified as
 having a particular number of characters on every single line (sometimes
 referred to as record-based files).
 
    Because a "line in a program unit is a sequence of 72 characters",
 to quote X3.9-1978, the GNU Fortran language specifies that a
 stream-based text file is translated to GNU Fortran lines as follows:
 
    * A newline in the file is the character that represents the end of
      a line of text to the underlying system.  For example, on
      ASCII-based systems, a newline is the <NL> character, which has
      ASCII value 10 (decimal).
 
    * Each newline in the file serves to end the line of text that
      precedes it (and that does not contain a newline).
 
    * The end-of-file marker (`EOF') also serves to end the line of text
      that precedes it (and that does not contain a newline).
 
    * Any line of text that is shorter than 72 characters is padded to
      that length with spaces (called "blanks" in the standard).
 
    * Any line of text that is longer than 72 characters is truncated to
      that length, but the truncated remainder must consist entirely of
      spaces.
 
    * Characters other than newline and the GNU Fortran character set
      are invalid.
 
    For the purposes of the remainder of this description of the GNU
 Fortran language, the translation described above has already taken
 place, unless otherwise specified.
 
    The result of the above translation is that the source file appears,
 in terms of the remainder of this description of the GNU Fortran
 language, as if it had an arbitrary number of 72-character lines, each
 character being among the GNU Fortran character set.
 
    For example, if the source file itself has two newlines in a row,
 the second newline becomes, after the above translation, a single line
 containing 72 spaces.
Info Catalog
(g77.info) Character Set
(g77.info) Characters Lines Sequence
(g77.info) Continuation Line
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