App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 363 · 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 an output. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let price = 160; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 32; // 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 3 (c) line 4 (d) line 1
4. 4.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) checking a password (d) a result on screen
5. 5.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
6. 6.Which of these is an input? (a) a pop-up message (b) taking a photo (c) a beep sound (d) a result on screen
7. 7.True or false: a pop-up message is an output. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) speaking a command (d) working out a tip
9. 9.Which of these is an output? (a) checking a password (b) a beep sound (c) speaking a command (d) tapping a button
10. 10.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) tapping a button
11. 11.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: a result on screen is processing. (a) True (b) False
13. 13.⚙️ 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);
14. 14.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
15. 15.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
16. 16.⚙️ What number does this app show?
    let bill = 370; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) tapping a button (d) speaking a command
18. 18.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
19. 19.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
21. 21.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
22. 22.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
23. 23.Which of these is an input? (a) sorting the scores (b) checking a password (c) a beep sound (d) typing your age
24. 24.True or false: tapping a button is processing. (a) False (b) True
25. 25.True or false: a result on screen is an input. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) taking a photo (d) sorting the scores
27. 27.True or false: taking a photo is an output. (a) True (b) False
28. 28.Which of these is processing? (a) taking a photo (b) a pop-up message (c) working out a tip (d) speaking a command
29. 29.True or false: a buzz (vibration) is processing. (a) True (b) False
30. 30.Which of these is an input? (a) tapping a button (b) checking a password (c) a result on screen (d) a buzz (vibration)
31. 31.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ 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 1 (b) line 2 (c) line 3
33. 33.True or false: a beep sound is an input. (a) True (b) False
34. 34.Which of these is processing? (a) speaking a command (b) a pop-up message (c) adding up a bill (d) tapping a button
35. 35.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.True or false: checking a password is processing. (a) True (b) False
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 1 (c) line 3 (d) line 2
38. 38.Which of these is an input? (a) a pop-up message (b) checking a password (c) speaking a command (d) a beep sound
39. 39.Which of these is processing? (a) sorting the scores (b) tapping a button (c) taking a photo (d) typing your age
40. 40.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);

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