While loop not working

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I am confused ....i have write right code for while but its not working. I have tried many ways to use while but no one is working....
Even i have usind chmod ....but it is not working please help me

What I have tried:

echo "enter a number"
read n
j=$n
s=0

while [ $n -gt 0 ]
do
         r='expr $n % 10'
         n='expr $n / 10'
         s='expr $s + $r \* $r \* $r'
done

if test $s -eq $j
then
         echo "Armstrong number"
else
         echo "not an armstrong"
fi

Posted 11-May-16 5:08am

Naveen Roy

Updated 17-Oct-16 8:21am

Albert Holguin

v2

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Comments

Mohibur Rashid 11-May-16 11:19am

There is a difference between ` and '. You are suppose to pick `

Naveen Roy 26-Jan-17 4:14am

you was right sir why did not you post in solution

2 solutions

Solution 1

I have finally got this to run by removing all the ^M characters at the end of each line in the script file. Note that these characters do not show up when the file is listed, but are quite clearly visible when editing the file with vi. I suspect this is the old Windows vs Unix end of line issue which comes up from time to time.

Posted 11-May-16 23:37pm

Richard MacCutchan

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Naveen Roy · Accepted Answer · 2016-10-17T08:21:00

Solution 2

I have wrongly typed ` its actully shift + ~ i.e. `
That was the problem.

Posted 17-Oct-16 8:21am

Naveen Roy