GCD Homework. Untraced error with an "if" Post: 302598120

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Homework and Emergencies Homework & Coursework Questions GCD Homework. Untraced error with an "if" Post 302598120 by george88 on Monday 13th of February 2012 12:27:32 PM

02-13-2012

Registered User

Adding to the above corrections, use "-lt" instead of "<".
Also the script you wrote will be in an infinite loop. There will be no changes to $a and $b since $drop is always equal to zero. Restructuring yours to work would be impossible, hence i wrote a new one::

Code:

if [ $# -lt 2 ]
then
           echo "Wrong usage"
           exit -1
elif [ $1 -le 0 -o $2 -le 0 ]
then
           echo "Invalid args"
           exit -1
fi

#get the smallest of 2 args and store it in $div

a=$1
b=$2
if [ $a -lt $b ]
then
           div=$a
elif [ $b -lt $a ]
then
           div=$b
else
           div=$a
fi
#loop from $div to 1 till $div divides both $a and $b completly

while [ $div -gt 0 ]
do
           remA=`expr $a % $div`
           remB=`expr $b % $div`
           if [ $remA -eq 0 -a $remB -eq 0 ]
           then
                      echo "GCD of $a and $b is $div"
                      exit 0
           fi
           div=`expr $div - 1`
done
echo "GCD of $a and $b is 1"
exit 0

Last edited by george88; 02-13-2012 at 01:39 PM..

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rediff

REDIFF(1)							     Man pages								 REDIFF(1)

NAME

       rediff, editdiff - fix offsets and counts of a hand-edited diff

SYNOPSIS

       rediff ORIGINAL EDITED

       rediff EDITED

       rediff {[--help] | [--version]}

       editdiff FILE

       editdiff {[--help] | [--version]}

DESCRIPTION

       You can use rediff to correct a hand-edited unified diff. Take a copy of the diff you want to edit, and edit it without changing any
       offsets or counts (the lines that begin "@@"). Then run rediff, telling it the name of the original diff file and the name of the one you
       have edited, and it will output the edited diff file but with corrected offsets and counts.

       A small script, editdiff, is provided for editing a diff file in-place.

       The types of changes that are currently handled are:

       o   Modifying the text of any file content line (of course).

       o   Adding new line insertions or deletions.

       o   Adding, changing or removing context lines. Lines at the context horizon are dealt with by adjusting the offset and/or count.

       o   Adding a single hunk (@@-prefixed section).

       o   Removing multiple hunk (@@-prefixed sections).

       Alternatively, if only one argument is provided, it is taken to be the edited file and the counts and offsets are adjusted as appropriate.
       Some assumptions are made when used in this mode. See recountdiff(1) for more information.

OPTIONS

       --help
	   Display a short usage message.

       --version
	   Display the version number of rediff.

SEE ALSO

       interdiff(1), recountdiff(1)

AUTHOR

       Tim Waugh <twaugh@redhat.com>
	   Package maintainer

patchutils							    13 May 2002 							 REDIFF(1)