App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 958 · 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 = 210; // 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
2. 2.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) working out a tip (d) typing your age
3. 3.True or false: taking a photo is an input. (a) True (b) False
4. 4.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 66; // 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 4 (b) line 1 (c) line 3 (d) line 2
6. 6.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) speaking a command (d) tapping a button
7. 7.True or false: a result on screen is an output. (a) False (b) True
8. 8.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
9. 9.True or false: taking a photo is processing. (a) False (b) True
10. 10.True or false: typing your age is processing. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) tapping a button (d) typing your age
12. 12.Which of these is an output? (a) speaking a command (b) a buzz (vibration) (c) sorting the scores (d) adding up a bill
13. 13.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) tapping a button (d) a beep sound
14. 14.Which of these is processing? (a) a beep sound (b) taking a photo (c) checking a password (d) typing your age
15. 15.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ 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);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
18. 18.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
19. 19.True or false: working out a tip is processing. (a) True (b) False
20. 20.⚙️ What number does this app show?
    let bill = 62; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.⚙️ What number does this app show?
    let bill = 100; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.True or false: a beep sound is processing. (a) False (b) True
23. 23.Which of these is processing? (a) taking a photo (b) speaking a command (c) a pop-up message (d) working out a tip
24. 24.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.True or false: tapping a button is processing. (a) False (b) True
26. 26.True or false: a pop-up message is processing. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
28. 28.⚙️ 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);
29. 29.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.⚙️ What number does this app show?
    let bill = 230; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.True or false: a buzz (vibration) is an output. (a) False (b) True
32. 32.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
33. 33.Which of these is processing? (a) tapping a button (b) adding up a bill (c) a buzz (vibration) (d) a result on screen
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 3 (c) line 2 (d) line 4
35. 35.True or false: adding up a bill is an output. (a) True (b) False
36. 36.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
37. 37.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 4 (b) line 1 (c) line 3 (d) line 2
39. 39.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
40. 40.Which of these is an input? (a) a buzz (vibration) (b) taking a photo (c) working out a tip (d) sorting the scores

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