App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 234 · 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 line does the processing (works out the answer)?
   line 1: let price = 100; // 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 2 (b) line 1 (c) line 4 (d) line 3
2. 2.Which of these is an output? (a) checking a password (b) speaking a command (c) a pop-up message (d) tapping a button
3. 3.True or false: adding up a bill is processing. (a) False (b) True
4. 4.Which of these is an input? (a) checking a password (b) a result on screen (c) adding up a bill (d) typing your age
5. 5.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
6. 6.Which of these is an input? (a) working out a tip (b) a result on screen (c) taking a photo (d) a beep sound
7. 7.⚙️ What number does this app show?
   let bill = 124; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.⚙️ What number does this app show?
   let price = 45; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
9. 9.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
10. 10.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
12. 12.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) working out a tip (d) sorting the scores
13. 13.🔍 Which is the odd one out? (a) a pop-up message (b) working out a tip (c) checking a password (d) sorting the scores
14. 14.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) typing your age (d) taking a photo
15. 15.⚙️ What number does this app show?
    let bill = 216; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.Which of these is processing? (a) checking a password (b) speaking a command (c) a pop-up message (d) a result on screen
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 4 (c) line 3 (d) line 2
18. 18.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
19. 19.True or false: sorting the scores is an output. (a) True (b) False
20. 20.True or false: adding up a bill is an output. (a) True (b) False
21. 21.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
22. 22.Which of these is an output? (a) tapping a button (b) sorting the scores (c) adding up a bill (d) a result on screen
23. 23.Which of these is an input? (a) adding up a bill (b) a buzz (vibration) (c) tapping a button (d) sorting the scores
24. 24.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
25. 25.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
26. 26.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) taking a photo (d) tapping a button
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 4 (b) line 2 (c) line 3 (d) line 1
28. 28.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
30. 30.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) a result on screen (d) a pop-up message
31. 31.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ What number does this app show?
    let price = 550; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.True or false: sorting the scores is processing. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) checking a password (d) working out a tip
37. 37.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
38. 38.Which of these is processing? (a) speaking a command (b) adding up a bill (c) a pop-up message (d) taking a photo
39. 39.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
40. 40.True or false: tapping a button is an output. (a) True (b) False

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