App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 458 · 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) adding up a bill (b) sorting the scores (c) typing your age (d) checking a password
2. 2.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) tapping a button (d) adding up a bill
3. 3.⚙️ What number does this app show?
   let price = 530; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ What number does this app show?
   let bill = 34; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.Which of these is processing? (a) speaking a command (b) typing your age (c) sorting the scores (d) a result on screen
6. 6.⚙️ What number does this app show?
   let price = 390; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 65; // 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 4 (b) line 2 (c) line 3 (d) line 1
9. 9.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) checking a password
10. 10.True or false: a pop-up message is processing. (a) True (b) False
11. 11.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: a result on screen is an input. (a) True (b) False
13. 13.⚙️ 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
14. 14.Which of these is an output? (a) taking a photo (b) typing your age (c) adding up a bill (d) a pop-up message
15. 15.True or false: adding up a bill is an input. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) a pop-up message (d) a buzz (vibration)
17. 17.Which of these is an output? (a) typing your age (b) adding up a bill (c) a result on screen (d) taking a photo
18. 18.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
19. 19.Which of these is an input? (a) a result on screen (b) typing your age (c) checking a password (d) working out a tip
20. 20.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
21. 21.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) sorting the scores
22. 22.⚙️ 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);
23. 23.Which of these is an input? (a) tapping a button (b) a beep sound (c) sorting the scores (d) adding up a bill
24. 24.True or false: sorting the scores is processing. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) taking a photo (d) adding up a bill
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 4 (b) line 1 (c) line 3 (d) line 2
27. 27.True or false: taking a photo is an output. (a) False (b) True
28. 28.Which of these is an input? (a) checking a password (b) adding up a bill (c) a buzz (vibration) (d) speaking a command
29. 29.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) working out a tip (d) a result on screen
30. 30.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ 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 2 (b) line 1 (c) line 3
32. 32.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
33. 33.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.True or false: adding up a bill is an output. (a) False (b) True
35. 35.True or false: a buzz (vibration) is an output. (a) False (b) True
36. 36.True or false: a result on screen is an output. (a) True (b) False
37. 37.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
38. 38.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
39. 39.Which of these is processing? (a) typing your age (b) a buzz (vibration) (c) a result on screen (d) checking a password
40. 40.Which of these is an output? (a) working out a tip (b) a beep sound (c) checking a password (d) taking a photo

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