App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 682 · 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 = 8; // 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 of these is processing? (a) tapping a button (b) adding up a bill (c) taking a photo (d) a beep sound
3. 3.⚙️ What number does this app show?
   let bill = 120; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.Which of these is an output? (a) tapping a button (b) a buzz (vibration) (c) sorting the scores (d) working out a tip
5. 5.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
6. 6.Which of these is an output? (a) tapping a button (b) speaking a command (c) checking a password (d) a beep sound
7. 7.⚙️ What number does this app show?
   let km = 15; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.True or false: a beep sound is an output. (a) False (b) True
9. 9.True or false: a pop-up message is an input. (a) True (b) False
10. 10.True or false: adding up a bill is an output. (a) True (b) False
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 285; // 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 2 (b) line 4 (c) line 1 (d) line 3
12. 12.🔍 Which is the odd one out? (a) speaking a command (b) a buzz (vibration) (c) taking a photo (d) typing your age
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 100; // 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 2 (b) line 3 (c) line 1 (d) line 4
14. 14.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
15. 15.True or false: typing your age is an input. (a) False (b) True
16. 16.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
17. 17.True or false: a buzz (vibration) is an output. (a) False (b) True
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 1 (c) line 2 (d) line 3
19. 19.True or false: tapping a button is processing. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) adding up a bill (d) typing your age
21. 21.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
22. 22.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
24. 24.⚙️ What number does this app show?
    let bill = 104; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.True or false: a result on screen is an input. (a) False (b) True
27. 27.Which of these is processing? (a) sorting the scores (b) taking a photo (c) a buzz (vibration) (d) a pop-up message
28. 28.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 2 (b) line 1 (c) line 4 (d) line 3
31. 31.True or false: sorting the scores is processing. (a) True (b) False
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 150; // 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 2 (b) line 1 (c) line 4 (d) line 3
33. 33.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
34. 34.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) tapping a button
35. 35.Which of these is processing? (a) speaking a command (b) a buzz (vibration) (c) working out a tip (d) typing your age
36. 36.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 3 (b) line 4 (c) line 2 (d) line 1
39. 39.True or false: sorting the scores is an input. (a) True (b) False
40. 40.⚙️ What number does this app show?
    let bill = 38; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);

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