Many values, one name

Computing · Programming · ages 15-16

Name ______________________ Date ____________

rainbowColours holds red, orange, yellow, green, blue, indigo and violet. What does rainbowColours[0] give?
- orange
- red
- violet
What is a list?
- One value stored under many names
- A name with no values at all
- Many values stored under one name
Appending adds the new item to the end of the list.
Circle one: True False
An empty chore list gets Wash the dishes, Do laundry, then Mow the lawn pushed on. What seat does Mow the lawn take?
Answer: ______________
After rainbowColours[4] = cyan, what sits in seat 4?
- cyan
- blue
- violet
Why does one list beat twenty separate variables for the same scores?
- Twenty names run faster
- One name holds them all, so the set stays tidy
- Variables cannot hold numbers
You insert a new item at the start of a list. What happens to the other seats?
- Each old item shifts one seat up
- Every seat keeps its old number
- Only the last item moves
A program reads slot 7 of a 7-item list and fails. What is the mistake?
- The list needs one more push first
- Slot 7 is invisible until printed
- Seats run 0 to 6, so slot 7 is past the end

Answer key

For grown-ups. Fold this page away before handing over the rest.

red · Seat 0 holds the first colour, which is red.
Many values stored under one name · A list bundles a whole collection under a single name.
True · Append grows the end, so the newcomer takes the next free seat.
2 · Three pushes fill seats 0, 1 and 2 in order.
cyan · Assignment rewrites that slot, so seat 4 now holds cyan.
One name holds them all, so the set stays tidy · A single name keeps the whole set together with zero clutter.
Each old item shifts one seat up · Squeezing one in at the front pushes each older item one seat along.
Seats run 0 to 6, so slot 7 is past the end · Seven items fill seats 0 to 6. Reaching for 7 is one too far.