App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 598 · 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 buzz (vibration) is an input. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) tapping a button (d) taking a photo
3. 3.Which of these is an input? (a) a beep sound (b) a pop-up message (c) sorting the scores (d) tapping a button
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 7; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
5. 5.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
6. 6.Which of these is an input? (a) checking a password (b) typing your age (c) sorting the scores (d) adding up a bill
7. 7.⚙️ What number does this app show?
   let price = 500; // 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 price = 170; // 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 1 (b) line 4 (c) line 2 (d) line 3
9. 9.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
10. 10.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
11. 11.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) typing your age (d) a buzz (vibration)
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 192; // 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 3 (b) line 1 (c) line 4 (d) line 2
14. 14.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) tapping a button (d) a result on screen
15. 15.True or false: adding up a bill is processing. (a) False (b) True
16. 16.Which of these is an output? (a) sorting the scores (b) working out a tip (c) checking a password (d) a result on screen
17. 17.True or false: typing your age is an output. (a) False (b) True
18. 18.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.Which of these is an output? (a) a buzz (vibration) (b) typing your age (c) taking a photo (d) tapping a button
20. 20.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) speaking a command (d) taking a photo
21. 21.Which of these is an output? (a) typing your age (b) working out a tip (c) a pop-up message (d) taking a photo
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 72; // 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 2 (b) line 1 (c) line 3 (d) line 4
23. 23.True or false: sorting the scores is an input. (a) True (b) False
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 230; // 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 3 (c) line 4 (d) line 2
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 3 (b) line 2 (c) line 1 (d) line 4
26. 26.True or false: working out a tip is processing. (a) False (b) True
27. 27.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) taking a photo (d) sorting the scores
28. 28.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) typing your age (d) speaking a command
30. 30.Which of these is an input? (a) taking a photo (b) checking a password (c) sorting the scores (d) working out a tip
31. 31.True or false: checking a password is processing. (a) True (b) False
32. 32.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
33. 33.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 183; // 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 3 (c) line 2 (d) line 4
35. 35.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) working out a tip (d) checking a password
36. 36.Which of these is an output? (a) typing your age (b) a beep sound (c) tapping a button (d) checking a password
37. 37.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
39. 39.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
40. 40.True or false: tapping a button is an input. (a) True (b) False

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