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STRUCT(1)							     STRUCT(1)

NAME
       struct - structure Fortran programs

SYNOPSIS
       struct [ option ] ...  file

DESCRIPTION
       Struct translates the Fortran program specified by file (standard input
       default) into a Ratfor  program.	  Wherever  possible,  Ratfor  control
       constructs replace the original Fortran.	 Statement numbers appear only
       where still necessary.  Cosmetic changes are made,  including  changing
       Hollerith  strings  into	 quoted	 strings and relational operators into
       symbols (.e.g. ".GT." into ">").	 The output is appropriately indented.

       The following options may occur in any order.

       -s     Input  is	 accepted  in  standard	 format,  i.e.	 comments  are
	      specified	 by  a	c, C, or * in column 1, and continuation lines
	      are specified by a nonzero,  nonblank  character	in  column  6.
	      Normally input is in the form accepted by f77(1)

       -i     Do  not  turn  computed  goto statements into switches.  (Ratfor
	      does not turn switches back into computed goto statements.)

       -a     Turn sequences of else ifs into a non-Ratfor switch of the form

	      switch
		   { case pred1: code
		     case pred2: code
		     case pred3: code
		     default: code
		   }

	      The case predicates are tested in order; the code appropriate to
	      only  one	 case  is  executed.   This generalized form of switch
	      statement does not occur in Ratfor.

       -b     Generate goto's instead of multilevel break statements.

       -n     Generate goto's instead of multilevel next statements.

       -tn    Make the nonzero integer n the lowest valued label in the output
	      program (default 10).

       -cn    Increment successive labels in the output program by the nonzero
	      integer n (default 1).

       -en    If n is 0 (default), place code within a loop  only  if  it  can
	      lead  to	an  iteration  of  the loop.  If n is nonzero, admit a
	      small code segments to a loop if otherwise the loop  would  have
	      exits  to	 several places including the segment, and the segment
	      can be reached only from the loop.  `Small' is close to, but not
	      equal  to, the number of statements in the code segment.	Values
	      of n under 10 are suggested.

FILES
       /tmp/struct*
       /usr/lib/struct/*

SEE ALSO
       f77(1)

BUGS
       Struct knows Fortran 66 syntax, but not full Fortran 77.
       If an input Fortran program contains  identifiers  which	 are  reserved
       words  in  Ratfor,  the structured version of the program will not be a
       valid Ratfor program.
       The labels generated cannot go above 32767.
       If you get a goto without a target, try -e .

7th Edition			April 29, 1985			     STRUCT(1)
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