Week 02 · Two Boxes, One Ship
Monday
Two boxes, one ship
// Copy one box and lower another
⏱ about 15 min
Welcome back, Code Crew!
Raven opens the auto-pilot program again.
She reads it slowly, line by line.
This time she finds two memory boxes.
One box is height. One box is speed.
Rocket asks if two boxes get mixed up.
Nova beeps. Let us find out together!
WARM-UP: MEMORY BOX POWERS
- Read each little program.
- Tap what Nova says.
set height to 4
say height
?
set height to 2
set height to 6
say height
?
set height to 3
change height by 1
change height by 1
say height
?
Back to the mystery
The ship still drops at the same spot.
The auto-pilot uses two boxes.
Bug hunters must read them both.
Two boxes, two numbers
Nova keeps two boxes now.
Height holds 3. Speed holds 2.
Each box has its own name tag.
What do you notice?
A line only touches the box it names.
The other box stays the same.
set height to 3 set speed to 2 say speed say height
Nova says 2 first, from speed.
Then Nova says 3, from height.
Each box kept its own number!
WHICH BOX? WHICH NUMBER?
- Read every line.
- Check the name tags. Tap the answer.
set height to 5
set speed to 1
say height
?
set speed to 4
set height to 2
say speed
?
set height to 3
set speed to 6
set height to 1
fly up height
?
Build a two-box test.
Nova must say 3, then say 5.
Fill each box before Nova peeks in it.
BUILD A TWO-BOX TEST
- Read each card.
- Make Nova say 3, then say 5.
1line 1
2line 2
3line 3
4line 4
Find the box the say line names.
| program | Nova says 4? |
|---|---|
| set height to 4, say height | ? |
| set speed to 4, say height | ? |
| set height to 4, set speed to 1, say height | ? |
| set speed to 4, set speed to 2, say speed | ? |
Two boxes, no mix-ups!
Each box has its own name.
A line only touches the box it names.
Great work, Crew!