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languages
RPN in Fortran

Fortran

Links of Relevance

Standards' documents:
The US Fortran Standards Committee page (with drafts of the current standard and other documents)
      A draft of the Fortran 2008 standard
      A draft of the Fortran 2003 standard (practically the same as the actual standard)
A draft of the Fortran 95 standard (practically the same as the actual standard); also here as a single file
Standard for Fortran 77
Standard for Fortran 66
Personal web pages with lot of information on Fortran:
Michael Metcalf's ‘Fortran 90/95/HPF Information File’
Clive Page's ‘List of Fortran Resources’
Michel Olagnon's Fortran 90 List
Free compilers or trial demos:
G95: the GNU Fortran 95 compiler
The Intel company offers free for personal use Fortran compilers
Silverfrost FTN95 Personal Edition: available for Windows only
Lahey Computer Systems, Inc.: a free trial demo; also an on-line syntax checker
Freely available books:
Interactive Fortran 77
Professional Programmer's Guide to Fortran77
Articles:
‘The New Features of Fortran 2003’
‘Fortran 90 and Computational Science’
Historical Fortran-related articles from ACM
The ‘COME FROM’ article (The GO TO statement became widely known mainly through Fortran. Later on, it has been the source of fervent controversies and numerous proposals for alternative control statements, serious and jocular)

The Fortran Company: a commercial site on Fortran

Fortranplus: has an extensive ‘Fortran resources file’

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