App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 124 · 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 line does the processing (works out the answer)?
   line 1: let bill = 132; // 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 3 (b) line 4 (c) line 1 (d) line 2
2. 2.True or false: typing your age is an input. (a) False (b) True
3. 3.Which of these is an output? (a) working out a tip (b) tapping a button (c) speaking a command (d) a result on screen
4. 4.True or false: a pop-up message is processing. (a) False (b) True
5. 5.⚙️ What number does this app show?
   let bill = 142; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.True or false: checking a password is processing. (a) True (b) False
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 95; // typed by the user
   line 2: let qty = 5; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 2 (b) line 4 (c) line 1 (d) line 3
8. 8.True or false: tapping a button is processing. (a) True (b) False
9. 9.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
10. 10.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
11. 11.Which of these is processing? (a) taking a photo (b) sorting the scores (c) a result on screen (d) a buzz (vibration)
12. 12.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) typing your age (d) speaking a command
13. 13.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a pop-up message
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 320; // 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 1 (b) line 2 (c) line 4 (d) line 3
15. 15.True or false: typing your age is an output. (a) True (b) False
16. 16.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
18. 18.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 1 (c) line 4 (d) line 3
20. 20.True or false: a result on screen is an output. (a) False (b) True
21. 21.Which of these is processing? (a) a buzz (vibration) (b) taking a photo (c) working out a tip (d) tapping a button
22. 22.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) taking a photo (d) tapping a button
23. 23.⚙️ 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 3 (b) line 2 (c) line 1
24. 24.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 245; // 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 4 (b) line 3 (c) line 1 (d) line 2
26. 26.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
27. 27.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) typing your age (d) tapping a button
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 204; // 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
29. 29.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
31. 31.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
32. 32.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) a pop-up message (d) a result on screen
33. 33.Which of these is processing? (a) a beep sound (b) taking a photo (c) a pop-up message (d) adding up a bill
34. 34.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
35. 35.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) tapping a button (d) taking a photo
36. 36.Which of these is an output? (a) checking a password (b) a beep sound (c) speaking a command (d) adding up a bill
37. 37.True or false: sorting the scores is an output. (a) False (b) True
38. 38.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
39. 39.🔍 Which is the odd one out? (a) working out a tip (b) taking a photo (c) speaking a command (d) typing your age
40. 40.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) sorting the scores (d) speaking a command

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