App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 376 · 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.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
2. 2.Which of these is processing? (a) a beep sound (b) a pop-up message (c) speaking a command (d) checking a password
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 64; // 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 1 (b) line 2 (c) line 3 (d) line 4
4. 4.Which of these is an output? (a) speaking a command (b) working out a tip (c) a pop-up message (d) typing your age
5. 5.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
6. 6.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 4; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
8. 8.True or false: a beep sound is processing. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) a buzz (vibration) (b) working out a tip (c) checking a password (d) adding up a bill
10. 10.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) speaking a command
11. 11.Which of these is an input? (a) sorting the scores (b) checking a password (c) taking a photo (d) a buzz (vibration)
12. 12.True or false: a pop-up message is an output. (a) True (b) False
13. 13.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
14. 14.True or false: adding up a bill is an input. (a) False (b) True
15. 15.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.True or false: sorting the scores is an output. (a) False (b) True
17. 17.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.⚙️ What number does this app show?
    let bill = 52; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a result on screen (d) adding up a bill
20. 20.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) tapping a button (d) a pop-up message
21. 21.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.Which of these is an input? (a) a result on screen (b) a beep sound (c) speaking a command (d) sorting the scores
23. 23.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) typing your age (d) tapping a button
24. 24.True or false: a beep sound is an output. (a) True (b) False
25. 25.⚙️ 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 2 (b) line 3 (c) line 1
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 2 (c) line 3 (d) line 1
27. 27.Which of these is an output? (a) checking a password (b) a buzz (vibration) (c) taking a photo (d) sorting the scores
28. 28.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
29. 29.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
30. 30.⚙️ What number does this app show?
    let bill = 216; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // 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 3 (b) line 1 (c) line 2 (d) line 4
34. 34.True or false: tapping a button is processing. (a) False (b) True
35. 35.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
36. 36.True or false: a buzz (vibration) is an input. (a) True (b) False
37. 37.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
38. 38.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
40. 40.True or false: taking a photo is an output. (a) True (b) False

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