what is the exact reason ?

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LEARN ABOUT V7

struct

STRUCT(1)						      General Commands 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 necessary.  Cosmetic changes are made, including chang-
       ing  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, a statement whose first nonblank character is not alphanumeric is treated
	      as a continuation.

       -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  state-
	      ment does not occur in Ratfor.

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

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

       -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 code segments
	      with fewer than n statements to a loop if otherwise the loop would have exits to several places including the segment, and the  seg-
	      ment can be reached only from the loop.

FILES

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

SEE ALSO

       f77(1)

BUGS

       Struct knows Fortran 66 syntax, but not full Fortran 77 (alternate returns, IF...THEN...ELSE, etc.)
       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.
       Extended range DO's generate cryptic errors.
       Columns 73-80 are not special even when -s is in effect.
       Will not generate Ratfor FOR statements.

																	 STRUCT(1)

Programming