App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 295 · 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 of these is an output? (a) checking a password (b) typing your age (c) a buzz (vibration) (d) taking a photo
2. 2.⚙️ What number does this app show?
   let price = 330; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) sorting the scores (d) speaking a command
4. 4.True or false: checking a password is processing. (a) False (b) True
5. 5.Which of these is an input? (a) sorting the scores (b) tapping a button (c) adding up a bill (d) a pop-up message
6. 6.⚙️ What number does this app show?
   let price = 460; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
8. 8.Which of these is processing? (a) typing your age (b) working out a tip (c) taking a photo (d) a buzz (vibration)
9. 9.Which of these is an input? (a) speaking a command (b) sorting the scores (c) adding up a bill (d) a buzz (vibration)
10. 10.True or false: a beep sound is an input. (a) True (b) False
11. 11.True or false: a pop-up message is an output. (a) True (b) False
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 36; // 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 3 (c) line 2 (d) line 1
13. 13.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
14. 14.True or false: checking a password is an input. (a) False (b) True
15. 15.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
17. 17.⚙️ What number does this app show?
    let bill = 56; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.True or false: a result on screen is processing. (a) True (b) False
19. 19.True or false: adding up a bill is processing. (a) False (b) True
20. 20.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
21. 21.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
22. 22.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
23. 23.True or false: typing your age is an output. (a) True (b) False
24. 24.⚙️ 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 2 (b) line 1 (c) line 3
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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
26. 26.🔍 Which is the odd one out? (a) checking a password (b) a buzz (vibration) (c) a result on screen (d) a beep sound
27. 27.True or false: a result on screen is an input. (a) True (b) False
28. 28.True or false: a result on screen is an output. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) a result on screen (d) a buzz (vibration)
30. 30.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) adding up a bill (d) a pop-up message
32. 32.Which of these is an input? (a) taking a photo (b) a beep sound (c) adding up a bill (d) a buzz (vibration)
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // typed by the user
    line 2: let qty = 3; // 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
34. 34.Which of these is processing? (a) typing your age (b) taking a photo (c) checking a password (d) a pop-up message
35. 35.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) checking a password (d) typing your age
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 219; // 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 2 (b) line 4 (c) line 1 (d) line 3
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 148; // 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 1 (d) line 4
38. 38.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
39. 39.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) tapping a button (d) checking a password
40. 40.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);

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