App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 301 · 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: adding up a bill is processing. (a) True (b) False
2. 2.Which of these is an input? (a) tapping a button (b) checking a password (c) sorting the scores (d) working out a tip
3. 3.Which of these is an input? (a) speaking a command (b) a pop-up message (c) sorting the scores (d) a beep sound
4. 4.True or false: a result on screen is an output. (a) False (b) True
5. 5.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 410; // typed by the user
   line 2: let off = 50; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 3 (b) line 1 (c) line 2 (d) line 4
7. 7.⚙️ What number does this app show?
   let price = 420; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.Which of these is an output? (a) adding up a bill (b) a result on screen (c) tapping a button (d) speaking a command
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 480; // 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 3 (d) line 4
10. 10.Which of these is processing? (a) tapping a button (b) a pop-up message (c) checking a password (d) taking a photo
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 4 (c) line 1 (d) line 2
12. 12.True or false: typing your age is an input. (a) False (b) True
13. 13.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.True or false: working out a tip is processing. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
16. 16.True or false: a buzz (vibration) is an output. (a) True (b) False
17. 17.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) sorting the scores (d) working out a tip
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 2 (c) line 4 (d) line 3
21. 21.True or false: taking a photo is an output. (a) False (b) True
22. 22.⚙️ 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
23. 23.⚙️ 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);
24. 24.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) tapping a button (d) a beep sound
25. 25.True or false: a beep sound is processing. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.Which of these is an input? (a) a buzz (vibration) (b) taking a photo (c) a pop-up message (d) working out a tip
29. 29.🔍 Which is the odd one out? (a) a buzz (vibration) (b) sorting the scores (c) a pop-up message (d) a result on screen
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 4 (c) line 3 (d) line 1
31. 31.True or false: working out a tip is an input. (a) False (b) True
32. 32.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
34. 34.True or false: taking a photo is processing. (a) True (b) False
35. 35.Which of these is an output? (a) a pop-up message (b) tapping a button (c) sorting the scores (d) taking a photo
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 3 (b) line 4 (c) line 2 (d) line 1
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
38. 38.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
40. 40.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) typing your age (d) a buzz (vibration)

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