# 2.11BSD#431 - /usr/man/cat1/struct.0

    STRUCT(1)	    UNIX Programmer's Manual		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 neces-
         sary.  Cosmetic changes are made, including changing Holler-
         ith 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 con-
    	  tinuation 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 gen-
    	  eralized 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

    Printed 11/26/99	October 22, 1996			1

    STRUCT(1)	    UNIX Programmer's Manual		STRUCT(1)

    	  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 oth-
    	  erwise 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/libexec/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 pro-
         gram will not be a valid Ratfor program.
         The labels generated cannot go above 32767.
         If you get a goto without a target, try -e .

    Printed 11/26/99	October 22, 1996			2

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