App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 43 · 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: a beep sound is an input. (a) False (b) True
2. 2.True or false: a buzz (vibration) is processing. (a) False (b) True
3. 3.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
4. 4.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
5. 5.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) speaking a command (d) tapping a button
6. 6.Which of these is processing? (a) checking a password (b) tapping a button (c) taking a photo (d) speaking a command
7. 7.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) speaking a command
8. 8.⚙️ What number does this app show?
   let bill = 44; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 7; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
10. 10.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.Which of these is an output? (a) adding up a bill (b) a result on screen (c) taking a photo (d) sorting the scores
12. 12.🔍 Which is the odd one out? (a) checking a password (b) a pop-up message (c) sorting the scores (d) working out a tip
13. 13.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) sorting the scores (d) tapping a button
15. 15.True or false: a result on screen is an output. (a) False (b) True
16. 16.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 4 (b) line 1 (c) line 3 (d) line 2
18. 18.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
19. 19.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
20. 20.True or false: speaking a command is processing. (a) True (b) False
21. 21.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.True or false: a beep sound is processing. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) a beep sound
24. 24.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
25. 25.Which of these is an input? (a) checking a password (b) a result on screen (c) tapping a button (d) sorting the scores
26. 26.Which of these is an input? (a) checking a password (b) a buzz (vibration) (c) adding up a bill (d) taking a photo
27. 27.Which of these is processing? (a) a beep sound (b) a result on screen (c) sorting the scores (d) taking a photo
28. 28.True or false: typing your age is an output. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let bill = 142; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 260; // 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 4 (b) line 3 (c) line 2 (d) line 1
31. 31.Which of these is an input? (a) sorting the scores (b) checking a password (c) adding up a bill (d) typing your age
32. 32.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (b) line 4 (c) line 1 (d) line 3
36. 36.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 260; // 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 1 (d) line 3
39. 39.True or false: sorting the scores is an input. (a) True (b) False
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2

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