eg. 1 + 1 = or 1 + 1 + 2 + 1 =
Both of these should be possible.
read -p "what's the first number? " n1 PS3="what's the operation? " select ans in add subtract multiply divide equals; do case $ans in add) op='+' ; break ;; subtract) op='-' ; break ;; multiply) op='*' ; break ;; divide) op='/' ; break ;; *) echo "invalid response" ;; esac done read -p "what's the second number? " n2 ans=$(echo "$n1 $op $n2" | bc -l) printf "%s %s %s = %s\n\n" "$n1" "$op" "$n2" "$ans" exit 0
This is what I have written so far, but i cannot work out how to make it possible to let the user choose 'equals' or to loop back round to enter another operation. Any ideas what I can do to my code here? I have been stuck on this all day.
I dont want the user to enter the equation themselves, i want them to be choosing from a list.