App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 769 · 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.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
2. 2.True or false: checking a password is an output. (a) True (b) False
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 85; // 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 2 (b) line 4 (c) line 1 (d) line 3
4. 4.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) typing your age (d) taking a photo
5. 5.True or false: a result on screen is an output. (a) False (b) True
6. 6.⚙️ What number does this app show?
   let price = 45; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
7. 7.True or false: typing your age is an input. (a) False (b) True
8. 8.True or false: checking a password is processing. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let price = 340; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.True or false: taking a photo is an input. (a) True (b) False
11. 11.Which of these is processing? (a) speaking a command (b) a beep sound (c) typing your age (d) adding up a bill
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
13. 13.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
14. 14.⚙️ What number does this app show?
    let bill = 225; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 2 (b) line 4 (c) line 1 (d) line 3
16. 16.True or false: sorting the scores is an input. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) sorting the scores (d) checking a password
18. 18.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.True or false: a pop-up message is processing. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) a buzz (vibration) (d) a result on screen
21. 21.Which of these is an output? (a) taking a photo (b) a result on screen (c) checking a password (d) typing your age
22. 22.Which of these is processing? (a) typing your age (b) taking a photo (c) tapping a button (d) sorting the scores
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 240; // 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 2 (b) line 1 (c) line 4 (d) line 3
24. 24.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.Which of these is an output? (a) speaking a command (b) a buzz (vibration) (c) working out a tip (d) checking a password
26. 26.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.True or false: a pop-up message is an output. (a) True (b) False
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 34; // 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 1 (c) line 4 (d) line 3
29. 29.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a buzz (vibration) (d) taking a photo
30. 30.Which of these is an input? (a) checking a password (b) working out a tip (c) speaking a command (d) a beep sound
31. 31.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.True or false: tapping a button is processing. (a) False (b) True
35. 35.True or false: taking a photo is processing. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ What number does this app show?
    let bill = 60; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.Which of these is an input? (a) a beep sound (b) typing your age (c) a result on screen (d) a pop-up message
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 1 (b) line 2 (c) line 4 (d) line 3
40. 40.⚙️ 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 3 (b) line 1 (c) line 2

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