#!/usr/bin/env ksh

# present the question, four choices then read and compare the answer with 
# the last parm (correct choice). increases the proper counter based on the selection. 
function ask
{
        typeset ans=""

        echo "$1"
        echo "a) $2"
        echo "b) $3"
        echo "c) $4"
        echo "d) $5"

        while true
        do
                printf "Enter your answer: "
                read ans
                case $ans in
                        a|b|c|d)
                                if [[ $ans == $6 ]]
                                then
                                        correct_tally=$(( correct_tally + 1 ))
                                else
                                        incorrect_tally=$(( incorrect_tally + 1 ))
                                fi
                                q=$(( $q + 1 ))
                                return
                                ;;

                        A|B|C|D)
                                echo "your caps-lock seems to be on; please use lowercase letters"
                                ;;

                        *)      echo "invalid response, please try again"
                                ;;
                esac
        done

}

q=0
nquestions=5
while (( $q < $nquestions ))
do
        case $q in
                0)      ask "London is in which country?" "United States" "China" "Canada" "England" "d";;
                1)      ask "The sky is what colour?" blue green grey orange a;;
                2)      ask "Insects have how many legs?" 3 6 9 12 b;;
                3)      ask "Which is the only fruit with the seeds on the outside?" strawberry bananna orange lime a;;
                4)      ask "Which month has just 28 days?" January March February May c;;
        esac
done

echo "your score: $correct_tally correct; $incorrect_tally wrong"

exit