F2C(1)                                                     F2C(1)

     NAME
          f2c - Convert Fortran 77 to C or C++

     SYNOPSIS
          f2c [ option ... ] file ...

     DESCRIPTION
          F2c converts Fortran 77 source code in files with names end-
          ing in `.f' or `.F' to C (or C++) source files in the
          current directory, with `.c' substituted for the final `.f'
          or `.F'.  If no Fortran files are named, f2c reads Fortran
          from standard input and writes C on standard output.  File
          names that end with `.p' or `.P' are taken to be prototype
          files, as produced by option `-P', and are read first.

          The following options have the same meaning as in f77(1).

          -C   Compile code to check that subscripts are within
               declared array bounds.

          -I2  Render INTEGER and LOGICAL as short, INTEGER*4 as long
               int.  Assume the default libF77 and libI77:  allow only
               INTEGER*4 (and no LOGICAL) variables in INQUIREs.
               Option `-I4' confirms the default rendering of INTEGER
               as long int.

          -onetrip
               Compile DO loops that are performed at least once if
               reached.  (Fortran 77 DO loops are not performed at all
               if the upper limit is smaller than the lower limit.)

          -U   Honor the case of variable and external names.  Fortran
               keywords must be in lower case.

          -u   Make the default type of a variable `undefined' rather
               than using the default Fortran rules.

          -w   Suppress all warning messages.  If the option is
               `-w66', only Fortran 66 compatibility warnings are
               suppressed.

          The following options are peculiar to f2c.

          -A   Produce ANSI C.  Default is old-style C.

          -a   Make local variables automatic rather than static
               unless they appear in a DATA, EQUIVALENCE, NAMELIST, or
               SAVE statement.

          -C++ Output C++ code.

          -c   Include original Fortran source as comments.

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     F2C(1)                                                     F2C(1)

          -E   Declare uninitialized COMMON to be Extern (overridably
               defined in f2c.h as extern).

          -ec  Place uninitialized COMMON blocks in separate files:
               COMMON /ABC/ appears in file abc_com.c.  Option `-e1c'
               bundles the separate files into the output file, with
               comments that give an unbundling sed(1) script.

          -ext Complain about f77(1) extensions.

          -g   Include original Fortran line numbers as comments.

          -i2  Similar to -I2, but assume a modified libF77 and libI77
               (compiled with -Df2c_i2), so INTEGER and LOGICAL vari-
               ables may be assigned by INQUIRE.

          -P   Write a file.P of ANSI (or C++) prototypes for pro-
               cedures defined in each input file.f or file.F.  When
               reading Fortran from standard input, write prototypes
               at the beginning of standard output.  Implies -A unless
               option `-C++' is present.  Option -Ps implies -P , and
               gives exit status 4 if rerunning f2c may change proto-
               types or declarations.

          -p   Supply preprocessor definitions to make common-block
               members look like local variables.

          -R   Do not promote REAL functions and operations to DOUBLE
               PRECISION.  Option `-!R' confirms the default, which
               imitates f77.

          -r8  Promote REAL to DOUBLE PRECISION, COMPLEX to DOUBLE
               COMPLEX.

          -Tdir
               Put temporary files in directory dir.

          -w8  Suppress warnings when COMMON or EQUIVALENCE forces
               odd-word alignment of doubles.

          -Wn  Assume n characters/word (default 4) when initializing
               numeric variables with character data.

          -z   Do not implicitly recognize DOUBLE COMPLEX.

          -!c  Inhibit C output, but produce -P output.

          -!I  Reject include statements.

          -!it Don't infer types of untyped EXTERNAL procedures from
               use as parameters to previously defined or prototyped
               procedures.

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     F2C(1)                                                     F2C(1)

          -!P  Do not attempt to infer ANSI or C++ prototypes from
               usage.

          The resulting C invokes the support routines of f77; object
          code should be loaded by f77 or with ld(1) or cc(1) options
          -lF77 -lI77 -lm.  Calling conventions are those of f77: see
          the reference below.

     FILES
          file.[fF]
               input file

          *.c  output file

          /usr/include/f2c.h
               header file

          /usr/lib/libF77.a
               intrinsic function library

          /usr/lib/libI77.a
               Fortran I/O library

          /lib/libc.a
               C library, see section 3

     SEE ALSO
          S. I. Feldman and P. J. Weinberger, `A Portable Fortran 77
          Compiler', UNIX Time Sharing System Programmer's Manual,
          Tenth Edition, Volume 2, AT&T Bell Laboratories, 1990.

     DIAGNOSTICS
          The diagnostics produced by f2c are intended to be self-
          explanatory.

     BUGS
          Floating-point constant expressions are simplified in the
          floating-point arithmetic of the machine running f2c, so
          they are typically accurate to at most 16 or 17 decimal
          places.
          Untypable EXTERNAL functions are declared int.

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