App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 69 · 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 price = 60; // 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 2 (b) line 4 (c) line 1 (d) line 3
2. 2.⚙️ What number does this app show?
   let bill = 78; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 2 (c) line 4 (d) line 1
4. 4.⚙️ What number does this app show?
   let km = 5; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 95; // 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 1 (c) line 2 (d) line 4
6. 6.True or false: taking a photo is processing. (a) True (b) False
7. 7.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) speaking a command (d) sorting the scores
8. 8.🔍 Which is the odd one out? (a) tapping a button (b) sorting the scores (c) speaking a command (d) typing your age
9. 9.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
10. 10.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
11. 11.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) a buzz (vibration) (d) a pop-up message
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
13. 13.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
14. 14.True or false: a pop-up message is processing. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.Which of these is an output? (a) taking a photo (b) working out a tip (c) typing your age (d) a buzz (vibration)
17. 17.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ What number does this app show?
    let bill = 108; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.Which of these is an output? (a) typing your age (b) a result on screen (c) tapping a button (d) checking a password
20. 20.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) adding up a bill (d) taking a photo
21. 21.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) speaking a command (d) typing your age
22. 22.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
23. 23.Which of these is an input? (a) speaking a command (b) sorting the scores (c) a result on screen (d) checking a password
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 560; // 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 2 (b) line 4 (c) line 3 (d) line 1
25. 25.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.True or false: adding up a bill is processing. (a) True (b) False
27. 27.⚙️ 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);
28. 28.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
30. 30.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a beep sound (d) checking a password
32. 32.Which of these is processing? (a) speaking a command (b) checking a password (c) typing your age (d) a beep sound
33. 33.True or false: a result on screen is processing. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) typing your age (d) speaking a command
35. 35.Which of these is an input? (a) adding up a bill (b) a buzz (vibration) (c) a pop-up message (d) tapping a button
36. 36.True or false: sorting the scores is an output. (a) True (b) False
37. 37.Which of these is an output? (a) working out a tip (b) tapping a button (c) typing your age (d) a pop-up message
38. 38.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
39. 39.🔍 Which is the odd one out? (a) typing your age (b) working out a tip (c) adding up a bill (d) checking a password
40. 40.True or false: taking a photo is an output. (a) False (b) True

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