App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 909 · 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 of these is an output? (a) a pop-up message (b) speaking a command (c) typing your age (d) taking a photo
2. 2.True or false: adding up a bill is processing. (a) False (b) True
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
4. 4.True or false: taking a photo is processing. (a) False (b) True
5. 5.⚙️ What number does this app show?
   let bill = 88; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ What number does this app show?
   let bill = 96; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.Which of these is an input? (a) speaking a command (b) a pop-up message (c) a beep sound (d) a result on screen
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 330; // 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 1 (c) line 4 (d) line 3
9. 9.Which of these is an output? (a) a buzz (vibration) (b) sorting the scores (c) adding up a bill (d) taking a photo
10. 10.True or false: speaking a command is processing. (a) False (b) True
11. 11.True or false: tapping a button is an input. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) typing your age (d) adding up a bill
13. 13.🔍 Which is the odd one out? (a) speaking a command (b) sorting the scores (c) tapping a button (d) typing your age
14. 14.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a result on screen
16. 16.Which of these is processing? (a) working out a tip (b) a result on screen (c) tapping a button (d) a buzz (vibration)
17. 17.True or false: checking a password is processing. (a) False (b) True
18. 18.Which of these is processing? (a) taking a photo (b) adding up a bill (c) speaking a command (d) a buzz (vibration)
19. 19.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) sorting the scores (d) a pop-up message
21. 21.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) checking a password (d) tapping a button
22. 22.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a beep sound (d) speaking a command
23. 23.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
24. 24.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
25. 25.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 540; // 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 4 (d) line 2
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 81; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 4 (c) line 2 (d) line 3
28. 28.⚙️ 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 4 (d) line 3
29. 29.True or false: adding up a bill is an output. (a) True (b) False
30. 30.True or false: typing your age is an output. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) taking a photo
32. 32.True or false: working out a tip is an input. (a) False (b) True
33. 33.⚙️ 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 1 (b) line 2 (c) line 3
34. 34.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.True or false: speaking a command is an input. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.True or false: tapping a button is an output. (a) False (b) True
39. 39.Which of these is an input? (a) a result on screen (b) a beep sound (c) typing your age (d) adding up a bill
40. 40.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output

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