App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 490 · 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: taking a photo is an input. (a) False (b) True
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 11; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
3. 3.⚙️ What number does this app show?
   let price = 500; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ What number does this app show?
   let bill = 72; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 45; // 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 1 (b) line 2 (c) line 3 (d) line 4
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 272; // 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 1 (b) line 2 (c) line 4 (d) line 3
7. 7.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) typing your age (d) working out a tip
8. 8.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) tapping a button (d) taking a photo
9. 9.True or false: working out a tip is an input. (a) True (b) False
10. 10.Which of these is an input? (a) working out a tip (b) sorting the scores (c) a pop-up message (d) typing your age
11. 11.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) a pop-up message (d) speaking a command
13. 13.🔍 Which is the odd one out? (a) tapping a button (b) a pop-up message (c) a result on screen (d) a beep sound
14. 14.True or false: tapping a button is an input. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let bill = 176; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.⚙️ What number does this app show?
    let price = 120; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.Which of these is an input? (a) working out a tip (b) a pop-up message (c) adding up a bill (d) tapping a button
18. 18.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
19. 19.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) typing your age (d) sorting the scores
20. 20.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) speaking a command
21. 21.Which of these is an input? (a) speaking a command (b) adding up a bill (c) a beep sound (d) sorting the scores
22. 22.True or false: checking a password is processing. (a) True (b) False
23. 23.Which of these is processing? (a) a result on screen (b) adding up a bill (c) a buzz (vibration) (d) taking a photo
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 2 (b) line 3 (c) line 4 (d) line 1
25. 25.True or false: a buzz (vibration) is an output. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) tapping a button (d) speaking a command
27. 27.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
28. 28.Which of these is processing? (a) a buzz (vibration) (b) sorting the scores (c) a beep sound (d) taking a photo
29. 29.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
32. 32.True or false: taking a photo is processing. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) working out a tip (b) a result on screen (c) adding up a bill (d) sorting the scores
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // 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
35. 35.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
36. 36.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) working out a tip (d) a beep sound
37. 37.Which of these is an output? (a) adding up a bill (b) a pop-up message (c) working out a tip (d) speaking a command
38. 38.True or false: typing your age is an output. (a) False (b) True
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // 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 2 (b) line 3 (c) line 4 (d) line 1
40. 40.⚙️ 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);

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