App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 223 · 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) tapping a button (b) a buzz (vibration) (c) taking a photo (d) typing your age
2. 2.Which of these is an output? (a) sorting the scores (b) tapping a button (c) typing your age (d) a buzz (vibration)
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 490; // 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 2 (b) line 4 (c) line 1 (d) line 3
4. 4.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
5. 5.True or false: a pop-up message is an output. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) speaking a command (d) a buzz (vibration)
7. 7.⚙️ What number does this app show?
   let price = 110; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.⚙️ 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 3 (b) line 2 (c) line 1
9. 9.True or false: tapping a button is an input. (a) True (b) False
10. 10.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
11. 11.Which of these is an input? (a) adding up a bill (b) working out a tip (c) typing your age (d) a result on screen
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 2 (c) line 3 (d) line 4
13. 13.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) checking a password
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 175; // 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 3 (d) line 4
15. 15.True or false: tapping a button is processing. (a) False (b) True
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 3 (b) line 1 (c) line 2 (d) line 4
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 98; // 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
18. 18.⚙️ 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 3 (d) line 1
19. 19.Which of these is processing? (a) typing your age (b) taking a photo (c) tapping a button (d) working out a tip
20. 20.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) a result on screen (d) sorting the scores
21. 21.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
22. 22.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
23. 23.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
24. 24.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
25. 25.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a buzz (vibration) (d) taking a photo
26. 26.Which of these is an input? (a) taking a photo (b) checking a password (c) adding up a bill (d) a beep sound
27. 27.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) sorting the scores
28. 28.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) typing your age (d) a result on screen
29. 29.True or false: a result on screen is an input. (a) True (b) False
30. 30.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.⚙️ 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 3 (b) line 1 (c) line 2
32. 32.Which of these is processing? (a) a buzz (vibration) (b) a result on screen (c) adding up a bill (d) taking a photo
33. 33.⚙️ What number does this app show?
    let bill = 232; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 510; // 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 1 (b) line 2 (c) line 3 (d) line 4
35. 35.Which of these is an input? (a) tapping a button (b) adding up a bill (c) checking a password (d) a pop-up message
36. 36.True or false: checking a password is processing. (a) False (b) True
37. 37.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
38. 38.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.True or false: speaking a command is an output. (a) True (b) False
40. 40.Which of these is an output? (a) adding up a bill (b) working out a tip (c) taking a photo (d) a result on screen

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