(g77.info) Source Form

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 Source Form
 ===========
 
    GNU Fortran accepts programs written in either fixed form or free
 form.
 
    Fixed form corresponds to ANSI FORTRAN 77 (plus popular extensions,
 such as allowing tabs) and Fortran 90's fixed form.
 
    Free form corresponds to Fortran 90's free form (though possibly not
 entirely up-to-date, and without complaining about some things that for
 which Fortran 90 requires diagnostics, such as the spaces in the
 constant in `R = 3 . 1').
 
    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.  GNU Fortran currently tries to be somewhat like a few
 popular compilers (`f2c', Digital ("DEC") Fortran, and so on), though a
 cleaner default definition along with more flexibility offered by
 command-line options is likely to be offered in version 0.6.
 
    This section describes how `g77' interprets source lines.
 

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* Carriage Returns  Carriage returns ignored.
* Tabs              Tabs converted to spaces.
* Short Lines       Short lines padded with spaces (fixed-form only).
* Long Lines        Long lines truncated.
* Ampersands        Special Continuation Lines.
 

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