App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 485 · 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 = 15; // 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.⚙️ What number does this app show?
   let km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) speaking a command (d) a result on screen
4. 4.⚙️ What number does this app show?
   let bill = 170; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.Which of these is an output? (a) tapping a button (b) a beep sound (c) working out a tip (d) sorting the scores
6. 6.⚙️ What number does this app show?
   let bill = 375; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.⚙️ What number does this app show?
   let km = 8; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.Which of these is an input? (a) a beep sound (b) checking a password (c) a buzz (vibration) (d) tapping a button
9. 9.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
10. 10.Which of these is an output? (a) a buzz (vibration) (b) checking a password (c) adding up a bill (d) sorting the scores
11. 11.Which of these is an output? (a) speaking a command (b) working out a tip (c) a result on screen (d) tapping a button
12. 12.Which of these is processing? (a) sorting the scores (b) taking a photo (c) a beep sound (d) a pop-up message
13. 13.⚙️ What number does this app show?
    let bill = 34; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.True or false: a result on screen is an output. (a) False (b) True
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
16. 16.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
18. 18.True or false: a result on screen is processing. (a) False (b) True
19. 19.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.True or false: taking a photo is an input. (a) True (b) False
22. 22.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.Which of these is an input? (a) checking a password (b) a result on screen (c) typing your age (d) sorting the scores
24. 24.True or false: a beep sound is processing. (a) True (b) False
25. 25.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
26. 26.⚙️ What number does this app show?
    let bill = 66; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ What number does this app show?
    let bill = 365; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
30. 30.Which of these is an output? (a) speaking a command (b) adding up a bill (c) a pop-up message (d) working out a tip
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 2 (b) line 3 (c) line 1 (d) line 4
32. 32.Which of these is processing? (a) taking a photo (b) checking a password (c) a beep sound (d) typing your age
33. 33.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) sorting the scores (d) adding up a bill
34. 34.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
35. 35.True or false: adding up a bill is processing. (a) True (b) False
36. 36.True or false: tapping a button is an input. (a) False (b) True
37. 37.⚙️ 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);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 230; // 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 2 (b) line 4 (c) line 3 (d) line 1
39. 39.⚙️ 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);
40. 40.⚙️ What number does this app show?
    let bill = 142; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);

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