App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 787 · 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 of these is an input? (a) adding up a bill (b) checking a password (c) tapping a button (d) a buzz (vibration)
3. 3.Which of these is an output? (a) checking a password (b) a pop-up message (c) working out a tip (d) sorting the scores
4. 4.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
6. 6.True or false: a beep sound is processing. (a) False (b) True
7. 7.True or false: adding up a bill is processing. (a) False (b) True
8. 8.Which of these is an output? (a) typing your age (b) sorting the scores (c) taking a photo (d) a beep sound
9. 9.True or false: adding up a bill is an input. (a) False (b) True
10. 10.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
11. 11.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) working out a tip (d) sorting the scores
12. 12.True or false: checking a password is an input. (a) True (b) False
13. 13.True or false: a beep sound is an input. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) sorting the scores (d) taking a photo
15. 15.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
16. 16.Which of these is an output? (a) tapping a button (b) a result on screen (c) working out a tip (d) taking a photo
17. 17.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) a pop-up message (d) checking a password
18. 18.True or false: a pop-up message is an input. (a) True (b) False
19. 19.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // 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 3 (b) line 2 (c) line 1 (d) line 4
21. 21.True or false: sorting the scores is an input. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) a beep sound
23. 23.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ 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 3 (c) line 2
25. 25.Which of these is processing? (a) a result on screen (b) tapping a button (c) a buzz (vibration) (d) sorting the scores
26. 26.Which of these is processing? (a) adding up a bill (b) speaking a command (c) taking a photo (d) a result on screen
27. 27.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.True or false: speaking a command is an input. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) typing your age
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 4 (b) line 2 (c) line 3 (d) line 1
32. 32.⚙️ 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);
33. 33.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 200; // 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 1 (b) line 2 (c) line 3 (d) line 4
35. 35.True or false: sorting the scores is processing. (a) False (b) True
36. 36.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) checking a password
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
38. 38.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
39. 39.True or false: a buzz (vibration) is an input. (a) False (b) True
40. 40.Which of these is processing? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) working out a tip

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