App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 950 · 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.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
2. 2.True or false: taking a photo is an input. (a) False (b) True
3. 3.⚙️ What number does this app show?
   let bill = 63; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.Which of these is processing? (a) sorting the scores (b) taking a photo (c) typing your age (d) a beep sound
5. 5.True or false: speaking a command is an input. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) taking a photo (d) tapping a button
7. 7.Which of these is an output? (a) adding up a bill (b) typing your age (c) a result on screen (d) speaking a command
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 590; // 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 1 (d) line 3
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // 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 1 (b) line 3 (c) line 4 (d) line 2
10. 10.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
11. 11.Which of these is an output? (a) speaking a command (b) a beep sound (c) tapping a button (d) typing your age
12. 12.True or false: a buzz (vibration) is an input. (a) True (b) False
13. 13.True or false: a buzz (vibration) is an output. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) a beep sound (b) working out a tip (c) a result on screen (d) a buzz (vibration)
15. 15.True or false: taking a photo is processing. (a) True (b) False
16. 16.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.True or false: a pop-up message is an output. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) checking a password (b) a buzz (vibration) (c) a result on screen (d) a pop-up message
19. 19.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) sorting the scores (d) a result on screen
20. 20.True or false: a pop-up message is an input. (a) False (b) True
21. 21.Which of these is an input? (a) checking a password (b) sorting the scores (c) a beep sound (d) tapping a button
22. 22.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) tapping a button (d) working out a tip
23. 23.Which of these is processing? (a) adding up a bill (b) a beep sound (c) tapping a button (d) a result on screen
24. 24.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
25. 25.⚙️ What number does this app show?
    let bill = 155; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
27. 27.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
29. 29.True or false: speaking a command is an output. (a) True (b) False
30. 30.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
31. 31.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) a buzz (vibration) (d) a beep sound
32. 32.True or false: checking a password is processing. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 65; // 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 2 (b) line 1 (c) line 4 (d) line 3
35. 35.Which of these is an input? (a) typing your age (b) sorting the scores (c) a buzz (vibration) (d) checking a password
36. 36.Which of these is an input? (a) sorting the scores (b) taking a photo (c) adding up a bill (d) a beep sound
37. 37.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) working out a tip (d) taking a photo
38. 38.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
39. 39.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 288; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 2 (c) line 1 (d) line 3

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