App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 746 · 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 result on screen an input, processing or an output? (a) processing (b) output (c) input
2. 2.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) checking a password (d) working out a tip
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 13; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 200; // 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 3 (c) line 1 (d) line 4
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 57; // 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 2 (c) line 3 (d) line 4
6. 6.Which of these is an output? (a) checking a password (b) a beep sound (c) adding up a bill (d) working out a tip
7. 7.Which of these is an output? (a) sorting the scores (b) typing your age (c) tapping a button (d) a pop-up message
8. 8.Which of these is an input? (a) adding up a bill (b) a pop-up message (c) a beep sound (d) typing your age
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 112; // 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 1 (b) line 2 (c) line 3 (d) line 4
10. 10.True or false: a beep sound is an output. (a) False (b) True
11. 11.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) tapping a button (d) typing your age
13. 13.⚙️ What number does this app show?
    let bill = 84; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.True or false: a result on screen is an input. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) taking a photo (d) typing your age
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 1 (b) line 3 (c) line 4 (d) line 2
18. 18.True or false: a result on screen is processing. (a) True (b) False
19. 19.True or false: typing your age is an input. (a) True (b) False
20. 20.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
21. 21.Which of these is an output? (a) tapping a button (b) typing your age (c) speaking a command (d) a buzz (vibration)
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) working out a tip (d) a beep sound
23. 23.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) a pop-up message (d) a result on screen
24. 24.True or false: typing your age is processing. (a) True (b) False
25. 25.⚙️ What number does this app show?
    let bill = 125; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
27. 27.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
28. 28.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
29. 29.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) a beep sound
30. 30.Which of these is an input? (a) speaking a command (b) a buzz (vibration) (c) adding up a bill (d) sorting the scores
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // 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 3 (b) line 4 (c) line 1 (d) line 2
32. 32.True or false: speaking a command is processing. (a) True (b) False
33. 33.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
34. 34.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
35. 35.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ What number does this app show?
    let bill = 240; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.Which of these is processing? (a) sorting the scores (b) tapping a button (c) a pop-up message (d) a beep sound
39. 39.True or false: a buzz (vibration) is an output. (a) True (b) False
40. 40.True or false: speaking a command is an input. (a) False (b) True

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