App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 431 · 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) tapping a button (b) taking a photo (c) sorting the scores (d) a beep sound
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
3. 3.⚙️ What number does this app show?
   let price = 15; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 140; // 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
6. 6.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
7. 7.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
8. 8.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) working out a tip (d) checking a password
9. 9.True or false: taking a photo is an input. (a) True (b) False
10. 10.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
11. 11.Which of these is processing? (a) speaking a command (b) a buzz (vibration) (c) working out a tip (d) tapping a button
12. 12.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) taking a photo (d) typing your age
13. 13.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
14. 14.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a result on screen (d) taking a photo
15. 15.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) speaking a command (d) a result on screen
16. 16.Which of these is processing? (a) a beep sound (b) sorting the scores (c) a buzz (vibration) (d) typing your age
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 325; // 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 3 (b) line 2 (c) line 4 (d) line 1
18. 18.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) typing your age (d) taking a photo
19. 19.Which of these is an output? (a) a pop-up message (b) taking a photo (c) tapping a button (d) checking a password
20. 20.True or false: taking a photo is an output. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.Which of these is an output? (a) adding up a bill (b) working out a tip (c) tapping a button (d) a result on screen
24. 24.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
26. 26.True or false: a result on screen is an input. (a) True (b) False
27. 27.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
28. 28.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
29. 29.Which of these is an output? (a) typing your age (b) checking a password (c) a buzz (vibration) (d) sorting the scores
30. 30.⚙️ 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);
31. 31.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
33. 33.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
35. 35.True or false: checking a password is processing. (a) False (b) True
36. 36.⚙️ 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 3 (b) line 1 (c) line 2
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 260; // 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 4 (c) line 2 (d) line 3
38. 38.⚙️ 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 2 (b) line 3 (c) line 1
39. 39.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) tapping a button (d) sorting the scores
40. 40.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) taking a photo (d) a beep sound

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