App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 658 · 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) a buzz (vibration) (b) a result on screen (c) a beep sound (d) adding up a bill
2. 2.Which of these is an output? (a) checking a password (b) typing your age (c) working out a tip (d) a result on screen
3. 3.True or false: a buzz (vibration) is an input. (a) False (b) True
4. 4.True or false: tapping a button is processing. (a) True (b) False
5. 5.⚙️ What number does this app show?
   let price = 240; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.True or false: adding up a bill is processing. (a) True (b) False
7. 7.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 570; // 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 1 (b) line 2 (c) line 4 (d) line 3
9. 9.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
10. 10.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) speaking a command
11. 11.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
13. 13.Which of these is an input? (a) a beep sound (b) sorting the scores (c) tapping a button (d) checking a password
14. 14.True or false: a result on screen is an input. (a) True (b) False
15. 15.True or false: sorting the scores is an input. (a) False (b) True
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 100; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 4 (c) line 3 (d) line 2
17. 17.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) tapping a button (d) speaking a command
18. 18.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
19. 19.⚙️ What number does this app show?
    let bill = 155; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) speaking a command (d) a pop-up message
21. 21.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
22. 22.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 540; // 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 2 (b) line 1 (c) line 3 (d) line 4
24. 24.True or false: checking a password is processing. (a) True (b) False
25. 25.Which of these is processing? (a) a pop-up message (b) typing your age (c) a beep sound (d) checking a password
26. 26.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
27. 27.True or false: a result on screen is processing. (a) False (b) True
28. 28.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
29. 29.Which of these is processing? (a) typing your age (b) a result on screen (c) working out a tip (d) taking a photo
30. 30.⚙️ 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
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
32. 32.Which of these is an input? (a) checking a password (b) sorting the scores (c) typing your age (d) a buzz (vibration)
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 3 (b) line 4 (c) line 1 (d) line 2
34. 34.True or false: speaking a command is processing. (a) False (b) True
35. 35.Which of these is an input? (a) a result on screen (b) taking a photo (c) adding up a bill (d) checking a password
36. 36.Which of these is processing? (a) a pop-up message (b) a buzz (vibration) (c) a result on screen (d) sorting the scores
37. 37.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) working out a tip (d) sorting the scores
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 400; // 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 4 (b) line 3 (c) line 1 (d) line 2
40. 40.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) adding up a bill (d) a pop-up message

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