App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 899 · 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) speaking a command (b) typing your age (c) checking a password (d) taking a photo
2. 2.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 126; // 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 2 (b) line 1 (c) line 4 (d) line 3
4. 4.Which of these is processing? (a) checking a password (b) speaking a command (c) typing your age (d) a buzz (vibration)
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 140; // 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 3 (c) line 1 (d) line 2
6. 6.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
7. 7.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) tapping a button (d) adding up a bill
8. 8.Which of these is an output? (a) working out a tip (b) a buzz (vibration) (c) sorting the scores (d) checking a password
9. 9.True or false: speaking a command is an input. (a) False (b) True
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 90; // 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 3 (b) line 1 (c) line 4 (d) line 2
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // 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 4 (b) line 1 (c) line 3 (d) line 2
12. 12.True or false: a buzz (vibration) is processing. (a) True (b) False
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 80; // 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 2 (b) line 1 (c) line 4 (d) line 3
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 1 (c) line 3 (d) line 4
15. 15.True or false: checking a password is an input. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.🔍 Which is the odd one out? (a) a beep sound (b) taking a photo (c) tapping a button (d) speaking a command
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 2 (d) line 4
20. 20.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
21. 21.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
22. 22.Which of these is processing? (a) tapping a button (b) a result on screen (c) a buzz (vibration) (d) working out a tip
23. 23.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
24. 24.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) tapping a button (d) speaking a command
25. 25.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) a beep sound (d) a pop-up message
26. 26.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.True or false: a buzz (vibration) is an input. (a) False (b) True
28. 28.True or false: working out a tip is processing. (a) False (b) True
29. 29.⚙️ 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 3 (b) line 1 (c) line 4 (d) line 2
30. 30.Which of these is processing? (a) typing your age (b) taking a photo (c) tapping a button (d) sorting the scores
31. 31.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) a result on screen (d) checking a password
32. 32.True or false: taking a photo is an input. (a) False (b) True
33. 33.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
34. 34.True or false: working out a tip is an input. (a) False (b) True
35. 35.True or false: typing your age is an input. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ What number does this app show?
    let km = 7; // 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 = 3; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);

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