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STRUCT(1)										STRUCT(1)

       struct - structure Fortran programs

       struct [ option ] ...  file

       Struct  translates  the	Fortran program specified by file (standard input default) into a
       Ratfor program.	Wherever possible, Ratfor control constructs replace  the  original  For-
       tran.   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

		   { 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

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

       -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 num-
	      ber of statements in the code segment.  Values of n under 10 are suggested.



       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				 October 22, 1996				STRUCT(1)
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