App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 565 · 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 = 140; // 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 1 (b) line 2 (c) line 3 (d) line 4
2. 2.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) speaking a command (d) working out a tip
3. 3.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) typing your age (d) checking a password
4. 4.True or false: speaking a command is an input. (a) True (b) False
5. 5.Which of these is an input? (a) a beep sound (b) taking a photo (c) adding up a bill (d) checking a password
6. 6.⚙️ What number does this app show?
   let km = 7; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
8. 8.True or false: a result on screen is an output. (a) False (b) True
9. 9.Which of these is processing? (a) tapping a button (b) adding up a bill (c) a result on screen (d) taking a photo
10. 10.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) a result on screen
11. 11.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 1 (b) line 2 (c) line 3 (d) line 4
13. 13.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) tapping a button (d) a buzz (vibration)
14. 14.⚙️ What number does this app show?
    let bill = 390; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
16. 16.⚙️ What number does this app show?
    let bill = 146; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
18. 18.True or false: a beep sound is an output. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
20. 20.True or false: a buzz (vibration) is processing. (a) True (b) False
21. 21.⚙️ 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 4 (b) line 1 (c) line 3 (d) line 2
22. 22.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 184; // 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 2 (c) line 3 (d) line 4
24. 24.True or false: adding up a bill is processing. (a) True (b) False
25. 25.True or false: adding up a bill is an input. (a) False (b) True
26. 26.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
27. 27.Which of these is an input? (a) tapping a button (b) a result on screen (c) sorting the scores (d) adding up a bill
28. 28.True or false: a buzz (vibration) is an input. (a) False (b) True
29. 29.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
30. 30.True or false: tapping a button is an input. (a) False (b) True
31. 31.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.True or false: speaking a command is an output. (a) False (b) True
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 260; // 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 4 (b) line 1 (c) line 2 (d) line 3
34. 34.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) sorting the scores (d) typing your age
36. 36.Which of these is an input? (a) checking a password (b) working out a tip (c) typing your age (d) a beep sound
37. 37.True or false: typing your age is an output. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ What number does this app show?
    let price = 420; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.True or false: checking a password is an output. (a) False (b) True

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