Modify the quiz program (page 508) so that the choices for a question are randomly arranged.

Question

What will be an ideal response?

Answer 1

Replace the line subjects=($(ls)) in the function choose_subj with
scramble_subj and add the following functions:
function exchange_subj ()
{
temp_value=${subjects[$1]}
subjects[$1]=${subjects[$2]}
subjects[$2]=$temp_value
}
#==================
function scramble_subj ()
{
declare -i index subjcount
subjects=($(ls))
subjcount=${#subjects}
# Number of elements
((index=subjcount-1))
while [[ $index > 0 ]]; do
((target=RANDOM % index))
exchange_subj $target $index
((index -= 1))
done
}
#==================