App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 68 · 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.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
2. 2.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
3. 3.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 2; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
5. 5.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) tapping a button
6. 6.⚙️ 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 3 (b) line 2 (c) line 1
7. 7.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
8. 8.True or false: checking a password is processing. (a) True (b) False
9. 9.Which of these is an input? (a) speaking a command (b) sorting the scores (c) working out a tip (d) a beep sound
10. 10.Which of these is an output? (a) checking a password (b) sorting the scores (c) adding up a bill (d) a buzz (vibration)
11. 11.True or false: tapping a button is an input. (a) True (b) False
12. 12.Which of these is processing? (a) typing your age (b) adding up a bill (c) taking a photo (d) a beep sound
13. 13.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) typing your age (d) taking a photo
14. 14.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // 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 3 (b) line 4 (c) line 2 (d) line 1
17. 17.True or false: speaking a command is an output. (a) False (b) True
18. 18.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 3 (b) line 1 (c) line 2 (d) line 4
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 3 (b) line 4 (c) line 2 (d) line 1
21. 21.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
23. 23.True or false: a buzz (vibration) is an input. (a) True (b) False
24. 24.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
25. 25.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) a beep sound
26. 26.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.Which of these is an output? (a) checking a password (b) tapping a button (c) speaking a command (d) a result on screen
28. 28.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) checking a password (d) a buzz (vibration)
29. 29.True or false: a result on screen is an output. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) adding up a bill (d) tapping a button
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 2 (d) line 4
32. 32.True or false: taking a photo is an input. (a) False (b) True
33. 33.Which of these is an input? (a) a pop-up message (b) a beep sound (c) working out a tip (d) tapping a button
34. 34.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) typing your age (d) working out a tip
35. 35.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
36. 36.Which of these is an output? (a) a pop-up message (b) tapping a button (c) checking a password (d) adding up a bill
37. 37.Which of these is processing? (a) working out a tip (b) tapping a button (c) a result on screen (d) a buzz (vibration)
38. 38.True or false: taking a photo is an output. (a) True (b) False
39. 39.Which of these is an output? (a) taking a photo (b) working out a tip (c) sorting the scores (d) a beep sound
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 3 (b) line 2 (c) line 4 (d) line 1

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