App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 420 · 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) True (b) False
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
3. 3.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) tapping a button (d) a buzz (vibration)
4. 4.Which of these is an output? (a) a beep sound (b) adding up a bill (c) speaking a command (d) checking a password
5. 5.Which of these is an output? (a) speaking a command (b) sorting the scores (c) taking a photo (d) a pop-up message
6. 6.⚙️ What number does this app show?
   let km = 5; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 430; // 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 3 (b) line 2 (c) line 1 (d) line 4
8. 8.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) typing your age (d) working out a tip
9. 9.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
10. 10.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 160; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 2 (d) line 4
13. 13.True or false: taking a photo is processing. (a) True (b) False
14. 14.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
15. 15.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) checking a password (d) taking a photo
16. 16.True or false: checking a password is processing. (a) False (b) True
17. 17.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.True or false: speaking a command is an output. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) a pop-up message
21. 21.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 2 (c) line 3 (d) line 1
23. 23.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 2 (c) line 4 (d) line 3
25. 25.Which of these is processing? (a) a result on screen (b) taking a photo (c) a pop-up message (d) adding up a bill
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 4 (b) line 1 (c) line 3 (d) line 2
27. 27.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
28. 28.True or false: sorting the scores is processing. (a) False (b) True
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 3 (c) line 2 (d) line 4
30. 30.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.True or false: tapping a button is an input. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) typing your age (d) a result on screen
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 117; // 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 4 (b) line 1 (c) line 2 (d) line 3
34. 34.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
35. 35.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) sorting the scores
36. 36.True or false: working out a tip is processing. (a) False (b) True
37. 37.True or false: taking a photo is an output. (a) True (b) False
38. 38.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) sorting the scores (d) typing your age
40. 40.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);

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