App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 96 · 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 result on screen is an output. (a) False (b) True
2. 2.True or false: a buzz (vibration) is an input. (a) True (b) False
3. 3.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
4. 4.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 85; // 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 2 (b) line 3 (c) line 4 (d) line 1
6. 6.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) adding up a bill (d) typing your age
7. 7.Which of these is an output? (a) a pop-up message (b) typing your age (c) working out a tip (d) tapping a button
8. 8.Which of these is processing? (a) a result on screen (b) working out a tip (c) typing your age (d) a buzz (vibration)
9. 9.⚙️ What number does this app show?
   let bill = 105; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.🔍 Which is the odd one out? (a) typing your age (b) a beep sound (c) a pop-up message (d) a buzz (vibration)
12. 12.⚙️ What number does this app show?
    let bill = 400; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 3 (c) line 2 (d) line 1
14. 14.True or false: taking a photo is an input. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let bill = 175; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.Which of these is an output? (a) checking a password (b) a result on screen (c) speaking a command (d) typing your age
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // 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
18. 18.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
19. 19.Which of these is an input? (a) a pop-up message (b) checking a password (c) typing your age (d) adding up a bill
20. 20.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
21. 21.Which of these is an input? (a) a beep sound (b) a buzz (vibration) (c) speaking a command (d) a result on screen
22. 22.True or false: working out a tip is processing. (a) True (b) False
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 4 (c) line 3 (d) line 2
24. 24.Which of these is an output? (a) adding up a bill (b) taking a photo (c) sorting the scores (d) a buzz (vibration)
25. 25.⚙️ 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 3 (b) line 1 (c) line 2 (d) line 4
26. 26.⚙️ 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);
27. 27.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.True or false: a buzz (vibration) is processing. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) taking a photo (b) a pop-up message (c) a buzz (vibration) (d) a result on screen
30. 30.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) speaking a command (d) tapping a button
31. 31.⚙️ What number does this app show?
    let price = 350; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
33. 33.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // typed by the user
    line 2: let off = 10; // 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
35. 35.Which of these is processing? (a) a result on screen (b) taking a photo (c) a buzz (vibration) (d) checking a password
36. 36.True or false: speaking a command is an input. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.True or false: a buzz (vibration) is an output. (a) True (b) False
39. 39.Which of these is processing? (a) speaking a command (b) adding up a bill (c) a beep sound (d) a result on screen
40. 40.Which of these is an input? (a) a result on screen (b) a beep sound (c) adding up a bill (d) tapping a button

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