App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 16 · 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 is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) adding up a bill (d) a beep sound
2. 2.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) taking a photo (d) typing your age
3. 3.True or false: a pop-up message is processing. (a) True (b) False
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 510; // 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 3 (c) line 4 (d) line 1
5. 5.🔍 Which is the odd one out? (a) a pop-up message (b) checking a password (c) adding up a bill (d) sorting the scores
6. 6.⚙️ What number does this app show?
   let bill = 390; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.True or false: adding up a bill is an input. (a) False (b) True
8. 8.True or false: checking a password is an output. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let bill = 395; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.True or false: adding up a bill is processing. (a) False (b) True
11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
12. 12.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
13. 13.Which of these is an output? (a) typing your age (b) speaking a command (c) checking a password (d) a result on screen
14. 14.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 3 (c) line 4 (d) line 1
16. 16.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
18. 18.True or false: taking a photo is an input. (a) True (b) False
19. 19.⚙️ What number does this app show?
    let bill = 154; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 3 (c) line 2 (d) line 1
22. 22.Which of these is an input? (a) adding up a bill (b) a result on screen (c) a pop-up message (d) typing your age
23. 23.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) tapping a button (d) speaking a command
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 4 (b) line 2 (c) line 3 (d) line 1
25. 25.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) taking a photo (d) typing your age
27. 27.True or false: typing your age is an input. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) adding up a bill (d) working out a tip
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 320; // 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 3 (b) line 2 (c) line 1 (d) line 4
30. 30.True or false: taking a photo is processing. (a) True (b) False
31. 31.True or false: adding up a bill is an output. (a) True (b) False
32. 32.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.Which of these is processing? (a) typing your age (b) a result on screen (c) checking a password (d) a buzz (vibration)
34. 34.Which of these is an input? (a) a result on screen (b) sorting the scores (c) tapping a button (d) working out a tip
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 270; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 1 (c) line 3 (d) line 2
36. 36.True or false: sorting the scores is an output. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) a buzz (vibration) (d) a result on screen
38. 38.Which of these is processing? (a) adding up a bill (b) typing your age (c) a pop-up message (d) a result on screen
39. 39.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a buzz (vibration) (d) sorting the scores
40. 40.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);

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