Unix Arithmatic operation issue , datatype issue Post: 302167017

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Top Forums Shell Programming and Scripting Unix Arithmatic operation issue , datatype issue Post 302167017 by otheus on Wednesday 13th of February 2008 09:23:23 AM

02-13-2008

Registered User

Quote:

Originally Posted by thambi

a=2147483647
expr $a + 2

for this i need to get the right result rather than -ve value.

I'm on a 64-bit machine, and awk and Perl seem to work fine here. I don't have access to a 32-bit machine at the moment. But try it with perl:

Code:

#!/usr/bin/env perl -w
$bc_lines=100;

local $maxint=int(2*(2**30 - 1)+1);
my $a=0;
my @subresults;

while ($_=<>) {
  chop;
  if ($maxint - int($_) < $a) {
    push @subresults, $a;
    $a=0;
  }
  $a+=int($_);
}
while (scalar(@subresults)) {
  print join("+\\\n",splice(@subresults,0,$bc_lines),"0\n");
}

Now run this script, pipe through bc *recursively* until there is only one line left. For example:

Code:

cp bigfile.txt outfile.txt 
while [ ! -f outfile.txt -o `grep -c ^ outfile.txt` -gt 1 ]; do 
  perl test.pl  outfile.txt  |bc >outfile.$$ ; 
  mv outfile.$$ outfile.txt; 
  echo "Subcalc complete" >&2; 
done ; 
cat outfile.txt

If bc complains with the same error, lower 100 to, say, 50. Keep cutting in half till no more complaints.

the GNU bc link is in my previous post.

otheus

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LEARN ABOUT SUSE

shcomp

SHCOMP(1)						       Korn shell utilities							 SHCOMP(1)

NAME

       shcomp - compile a shell script

SYNOPSIS

       shcomp [ options ] [infile [outfile]]

DESCRIPTION

       Unless  -D is specified, shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh can read and execute with
       the same effect as the original script.

       Since aliases are processed as the script is read, alias definitions whose value requires variable expansion will not work correctly.

       If -D is specified, all double quoted strings that are preceded by $ are output. These are the messages	that  need  to	be  translated	to
       locale specific versions for internationalization.

       If  outfile  is omitted, then the results will be written to standard output. If infile is also omitted, the shell script will be read from
       standard input.

OPTIONS

       [D dictionary] Generate a list of strings that need to be placed in a message catalog for internationalization.	[n noexec] Displays  warn-
       ing messages for obsolete or non-conforming constructs.	[v verbose] Displays input from infile onto standard error as it reads it.

EXIT STATUS

       0
	 Successful completion.
       >0
	 An error occurred.

SEE ALSO

       ksh(1)

IMPLEMENTATION

     version
       shcomp (AT&T Research) 2003-03-02
     author
       David Korn <dgk@research.att.com>
     copyright
       Copyright (c) 1982-2010 AT&T Intellectual Property
     license
       http://www.opensource.org/licenses/cpl1.0.txt

								    2003-03-02								 SHCOMP(1)

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