while loop problem

pfm200586 · #1 (**permalink**) 11-09-11, 03:17

Hello everyone,

I have this little for loop that I want to convert to a while loop. It accepts unknown number from the command line parameters and then add them all up and display the sum, here is the for loop:

HTML Code:

sum=0

for x in $*
do 
sum=`expr $sum + $argument`
done

echo $sum

it runs perfectly, any suggestions how to convert it to a while loop?

Thank you

Regards

stolze · #2 (**permalink**) 11-09-11, 12:30

You are aware that your loop doesn't work because you assign the arguments to "x" but then you add $argement?

Aside from a loop, you could also do something like this:

Code:

echo $* | sed -e 's/  */\+/g' | bc

pfm200586 · #3 (**permalink**) 11-09-11, 13:05

you are right I have to correct the x variable. But how can I make it run in a while loop that is my question

thanks

kitaman · #4 (**permalink**) 11-09-11, 13:13

Use the $# variable (the number of command line parameters)

Code:

num=$#
while [ $num -gt 0 ]
do
blah blah
num=`expr $num - 1`
done

or

Code:

while [ $1 -ne 0 ]
do
total=`expr $total + $1`
shift
done

Make the last command line parameter zero.

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