App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 733 · 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: working out a tip is processing. (a) False (b) True
2. 2.Which of these is an output? (a) a buzz (vibration) (b) tapping a button (c) checking a password (d) sorting the scores
3. 3.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 150; // 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 4 (d) line 2
5. 5.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
6. 6.Which of these is processing? (a) a beep sound (b) taking a photo (c) checking a password (d) typing your age
7. 7.True or false: adding up a bill is processing. (a) True (b) False
8. 8.True or false: a buzz (vibration) is an input. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a buzz (vibration) (d) checking a password
10. 10.⚙️ What number does this app show?
    let bill = 114; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
12. 12.⚙️ What number does this app show?
    let bill = 86; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.True or false: checking a password is an input. (a) True (b) False
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 590; // 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 3 (d) line 1
15. 15.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) a pop-up message (d) a beep sound
16. 16.True or false: speaking a command is an input. (a) True (b) False
17. 17.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
18. 18.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 65; // 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 1 (b) line 2 (c) line 3 (d) line 4
21. 21.True or false: speaking a command is processing. (a) False (b) True
22. 22.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 330; // 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 1 (b) line 2 (c) line 4 (d) line 3
24. 24.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) sorting the scores
25. 25.⚙️ 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
26. 26.True or false: tapping a button is processing. (a) False (b) True
27. 27.True or false: tapping a button is an input. (a) False (b) True
28. 28.True or false: tapping a button is an output. (a) False (b) True
29. 29.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 2 (c) line 3 (d) line 4
31. 31.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.True or false: a pop-up message is processing. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) tapping a button
35. 35.True or false: a result on screen is processing. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) working out a tip
37. 37.Which of these is processing? (a) tapping a button (b) a pop-up message (c) adding up a bill (d) speaking a command
38. 38.⚙️ What number does this app show?
    let price = 280; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.Which of these is an output? (a) typing your age (b) working out a tip (c) a pop-up message (d) checking a password
40. 40.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output

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