App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 62 · 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 km = 2; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
2. 2.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) taking a photo (d) adding up a bill
3. 3.True or false: working out a tip is processing. (a) False (b) True
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 1 (c) line 4 (d) line 3
5. 5.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) a buzz (vibration) (d) speaking a command
6. 6.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) a buzz (vibration) (d) a beep sound
7. 7.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
8. 8.Which of these is processing? (a) a result on screen (b) a beep sound (c) typing your age (d) sorting the scores
9. 9.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) typing your age (d) a result on screen
10. 10.True or false: a buzz (vibration) is processing. (a) True (b) False
11. 11.True or false: sorting the scores is an output. (a) False (b) True
12. 12.True or false: a buzz (vibration) is an output. (a) False (b) True
13. 13.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 24; // 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 1 (c) line 2 (d) line 4
16. 16.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
17. 17.True or false: sorting the scores is processing. (a) True (b) False
18. 18.Which of these is processing? (a) typing your age (b) working out a tip (c) taking a photo (d) a buzz (vibration)
19. 19.True or false: a beep sound is an input. (a) False (b) True
20. 20.⚙️ What number does this app show?
    let bill = 153; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 39; // 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 3 (d) line 4
22. 22.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) working out a tip
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 2 (b) line 4 (c) line 1 (d) line 3
24. 24.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
25. 25.Which of these is an input? (a) taking a photo (b) a pop-up message (c) sorting the scores (d) adding up a bill
26. 26.⚙️ What number does this app show?
    let bill = 100; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.True or false: typing your age is an output. (a) False (b) True
28. 28.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
29. 29.Which of these is an output? (a) taking a photo (b) checking a password (c) a beep sound (d) typing your age
30. 30.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.Which of these is an output? (a) taking a photo (b) adding up a bill (c) typing your age (d) a pop-up message
32. 32.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) typing your age (d) a pop-up message
33. 33.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 60; // 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 3 (b) line 1 (c) line 2 (d) line 4
35. 35.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) taking a photo (d) tapping a button
36. 36.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
37. 37.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
39. 39.Which of these is an output? (a) speaking a command (b) checking a password (c) tapping a button (d) a result on screen
40. 40.⚙️ What number does this app show?
    let price = 420; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);

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