App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 1 · 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.True or false: a buzz (vibration) is an output. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
4. 4.True or false: speaking a command is processing. (a) True (b) False
5. 5.True or false: speaking a command is an output. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) speaking a command (d) typing your age
7. 7.Which of these is processing? (a) typing your age (b) speaking a command (c) sorting the scores (d) tapping a button
8. 8.True or false: a result on screen is an output. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let price = 30; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
10. 10.Which of these is processing? (a) a pop-up message (b) checking a password (c) a buzz (vibration) (d) taking a photo
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 4 (b) line 2 (c) line 1 (d) line 3
12. 12.Which of these is an output? (a) typing your age (b) taking a photo (c) tapping a button (d) a buzz (vibration)
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 420; // 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 4 (b) line 2 (c) line 1 (d) line 3
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 1 (b) line 2 (c) line 4 (d) line 3
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 4 (c) line 1 (d) line 2
16. 16.Which of these is an output? (a) speaking a command (b) tapping a button (c) a pop-up message (d) checking a password
17. 17.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) a buzz (vibration) (d) sorting the scores
18. 18.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.⚙️ What number does this app show?
    let bill = 184; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 3 (c) line 1 (d) line 2
21. 21.True or false: a beep sound is processing. (a) True (b) False
22. 22.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
23. 23.True or false: typing your age is processing. (a) True (b) False
24. 24.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
25. 25.True or false: sorting the scores is processing. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let bill = 42; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
28. 28.Which of these is an output? (a) checking a password (b) typing your age (c) a beep sound (d) tapping a button
29. 29.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) a result on screen (d) typing your age
31. 31.Which of these is an input? (a) adding up a bill (b) working out a tip (c) speaking a command (d) checking a password
32. 32.True or false: a result on screen is processing. (a) True (b) False
33. 33.True or false: checking a password is an input. (a) False (b) True
34. 34.True or false: typing your age is an input. (a) True (b) False
35. 35.True or false: working out a tip is processing. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) checking a password (b) a pop-up message (c) adding up a bill (d) sorting the scores
37. 37.⚙️ 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);
38. 38.⚙️ 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 3 (b) line 1 (c) line 2
39. 39.Which of these is an output? (a) checking a password (b) typing your age (c) tapping a button (d) a result on screen
40. 40.Which of these is an input? (a) typing your age (b) working out a tip (c) a buzz (vibration) (d) sorting the scores

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