App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 834 · 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 price = 85; // 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 4 (c) line 1 (d) line 3
2. 2.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) tapping a button
3. 3.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) adding up a bill
4. 4.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ What number does this app show?
   let km = 8; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
7. 7.Which of these is processing? (a) tapping a button (b) checking a password (c) a beep sound (d) speaking a command
8. 8.Which of these is an input? (a) a buzz (vibration) (b) a beep sound (c) taking a photo (d) a pop-up message
9. 9.Which of these is an output? (a) a buzz (vibration) (b) sorting the scores (c) checking a password (d) speaking a command
10. 10.Which of these is processing? (a) a beep sound (b) sorting the scores (c) a pop-up message (d) speaking a command
11. 11.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) a beep sound
12. 12.True or false: a beep sound is an output. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) tapping a button (d) speaking a command
14. 14.Which of these is processing? (a) a buzz (vibration) (b) a result on screen (c) adding up a bill (d) speaking a command
15. 15.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
17. 17.True or false: adding up a bill is an input. (a) True (b) False
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // typed by the user
    line 2: let off = 30; // 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
19. 19.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
20. 20.True or false: taking a photo is an output. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.True or false: checking a password is an input. (a) True (b) False
23. 23.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
24. 24.True or false: checking a password is an output. (a) False (b) True
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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
26. 26.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
27. 27.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
28. 28.True or false: checking a password is processing. (a) True (b) False
29. 29.True or false: working out a tip is processing. (a) True (b) False
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 168; // 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 4 (b) line 3 (c) line 1 (d) line 2
31. 31.True or false: sorting the scores is processing. (a) False (b) True
32. 32.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
36. 36.True or false: a result on screen is an output. (a) True (b) False
37. 37.True or false: adding up a bill is an output. (a) False (b) True
38. 38.True or false: a buzz (vibration) is processing. (a) False (b) True
39. 39.Which of these is an output? (a) adding up a bill (b) taking a photo (c) sorting the scores (d) a result on screen
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 3 (b) line 4 (c) line 1 (d) line 2

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