App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 339 · 40 questions

Developer's tip (In, work, out): Input → processing → output. Input: typing, tapping, a photo, your voice. Output: a result on screen, a sound, a buzz, a pop-up. In code, the processing line works out a new value from the inputs; show() is the output.

1. 1.⚙️ What number does this app show?
   let km = 5; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // typed by the user
   line 2: let qty = 3; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 4 (b) line 2 (c) line 1 (d) line 3
3. 3.⚙️ What number does this app show?
   let bill = 64; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.⚙️ What number does this app show?
   let bill = 345; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
6. 6.Which of these is an output? (a) typing your age (b) a result on screen (c) checking a password (d) sorting the scores
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 72; // typed by the user
   line 2: let friends = 2; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 1 (b) line 4 (c) line 3 (d) line 2
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 10; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
9. 9.True or false: working out a tip is an input. (a) False (b) True
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 1 (c) line 2 (d) line 3
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
12. 12.Which of these is an input? (a) typing your age (b) sorting the scores (c) a pop-up message (d) adding up a bill
13. 13.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 52; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 2 (c) line 3 (d) line 4
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // typed by the user
    line 2: let qty = 3; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 4 (c) line 3 (d) line 2
16. 16.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // typed by the user
    line 2: let qty = 3; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 4 (c) line 2 (d) line 1
18. 18.Which of these is processing? (a) checking a password (b) speaking a command (c) taking a photo (d) typing your age
19. 19.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) checking a password (d) a pop-up message
20. 20.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
21. 21.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a result on screen (d) sorting the scores
22. 22.True or false: adding up a bill is an input. (a) False (b) True
23. 23.⚙️ What number does this app show?
    let bill = 144; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) a beep sound (d) tapping a button
25. 25.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) speaking a command
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
27. 27.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 54; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 2 (c) line 4 (d) line 3
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 4 (c) line 2 (d) line 1
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 156; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 4 (c) line 1 (d) line 3
31. 31.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 4 (c) line 1 (d) line 3
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 360; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 3 (c) line 1 (d) line 4
34. 34.⚙️ What number does this app show?
    let price = 280; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
36. 36.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
37. 37.Which of these is processing? (a) sorting the scores (b) taking a photo (c) a beep sound (d) typing your age
38. 38.True or false: tapping a button is processing. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 99; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 4 (c) line 2 (d) line 1
40. 40.Which of these is an output? (a) typing your age (b) tapping a button (c) checking a password (d) a buzz (vibration)

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