App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 611 · 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 120; // typed by the user
   line 2: let off = 20; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 3 (b) line 2 (c) line 1 (d) line 4
2. 2.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) a buzz (vibration) (d) checking a password
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 7; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
4. 4.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
5. 5.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) checking a password
6. 6.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
7. 7.True or false: typing your age is processing. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a buzz (vibration) (d) typing your age
9. 9.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a pop-up message (d) tapping a button
10. 10.Which of these is processing? (a) checking a password (b) a beep sound (c) a buzz (vibration) (d) taking a photo
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
12. 12.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
13. 13.Which of these is an input? (a) working out a tip (b) adding up a bill (c) a result on screen (d) tapping a button
14. 14.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) speaking a command
15. 15.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
16. 16.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) a beep sound (d) a result on screen
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
18. 18.Which of these is an output? (a) typing your age (b) taking a photo (c) adding up a bill (d) a buzz (vibration)
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 34; // 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 3 (b) line 2 (c) line 4 (d) line 1
20. 20.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 4 (c) line 3 (d) line 1
22. 22.True or false: checking a password is processing. (a) True (b) False
23. 23.Which of these is an output? (a) typing your age (b) tapping a button (c) a pop-up message (d) adding up a bill
24. 24.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
25. 25.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.True or false: typing your age is an input. (a) False (b) True
28. 28.True or false: tapping a button is an output. (a) False (b) True
29. 29.Which of these is an output? (a) tapping a button (b) adding up a bill (c) speaking a command (d) a result on screen
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 124; // 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 2 (c) line 4 (d) line 3
31. 31.True or false: tapping a button is an input. (a) False (b) True
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 3 (c) line 4 (d) line 1
33. 33.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.Which of these is processing? (a) typing your age (b) a buzz (vibration) (c) working out a tip (d) speaking a command
35. 35.Which of these is an input? (a) a pop-up message (b) checking a password (c) typing your age (d) a buzz (vibration)
36. 36.True or false: working out a tip is processing. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
38. 38.Which of these is an input? (a) a buzz (vibration) (b) taking a photo (c) working out a tip (d) sorting the scores
39. 39.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 530; // 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 4 (b) line 1 (c) line 2 (d) line 3

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