CSC 209: midterm solutions, March 2011

4. Write a 'while' loop in sh to add the squares of the integers from 20 to 50, inclusive, and output the total.

sum=0
n=20
while test $n -le 50
do
    squ=`expr $n \* $n`
    sum=`expr $sum + $squ`
    n=`expr $n + 1`
done
echo $sum