App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 711 · 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.True or false: typing your age is an input. (a) False (b) True
2. 2.True or false: taking a photo is processing. (a) False (b) True
3. 3.Which of these is an input? (a) a beep sound (b) a pop-up message (c) taking a photo (d) working out a tip
4. 4.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) a beep sound (d) a pop-up message
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 90; // 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 3 (c) line 4 (d) line 1
6. 6.True or false: a beep sound is processing. (a) True (b) False
7. 7.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 450; // 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 2 (b) line 1 (c) line 3 (d) line 4
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 30; // 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 1 (b) line 2 (c) line 4 (d) line 3
10. 10.⚙️ What number does this app show?
    let bill = 80; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) adding up a bill
12. 12.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 4 (c) line 3 (d) line 2
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 590; // 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 4 (c) line 3 (d) line 2
15. 15.True or false: tapping a button is an output. (a) True (b) False
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 4 (b) line 2 (c) line 1 (d) line 3
17. 17.🔍 Which is the odd one out? (a) speaking a command (b) sorting the scores (c) typing your age (d) tapping a button
18. 18.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) speaking a command (d) tapping a button
19. 19.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) tapping a button (d) a result on screen
20. 20.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
21. 21.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a beep sound (d) sorting the scores
22. 22.Which of these is processing? (a) typing your age (b) a result on screen (c) a pop-up message (d) sorting the scores
23. 23.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) tapping a button (d) speaking a command
24. 24.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
26. 26.True or false: typing your age is an output. (a) True (b) False
27. 27.Which of these is an input? (a) a buzz (vibration) (b) a pop-up message (c) speaking a command (d) a result on screen
28. 28.Which of these is an input? (a) a beep sound (b) sorting the scores (c) a buzz (vibration) (d) typing your age
29. 29.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
30. 30.True or false: a pop-up message is an output. (a) True (b) False
31. 31.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ 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);
34. 34.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
35. 35.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.True or false: checking a password is processing. (a) True (b) False
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 2 (b) line 1 (c) line 3 (d) line 4
39. 39.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 237; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 3 (c) line 2 (d) line 4

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