App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 115 · 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 input? (a) a result on screen (b) sorting the scores (c) working out a tip (d) tapping a button
2. 2.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) speaking a command (d) a pop-up message
3. 3.True or false: adding up a bill is an input. (a) False (b) True
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 8; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
5. 5.Which of these is an input? (a) checking a password (b) working out a tip (c) typing your age (d) adding up a bill
6. 6.True or false: sorting the scores is an output. (a) False (b) True
7. 7.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
8. 8.Which of these is processing? (a) speaking a command (b) working out a tip (c) tapping a button (d) a pop-up message
9. 9.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
10. 10.🔍 Which is the odd one out? (a) checking a password (b) taking a photo (c) sorting the scores (d) adding up a bill
11. 11.Which of these is processing? (a) taking a photo (b) a result on screen (c) typing your age (d) adding up a bill
12. 12.True or false: a buzz (vibration) is an input. (a) True (b) False
13. 13.Which of these is an output? (a) taking a photo (b) a pop-up message (c) checking a password (d) tapping a button
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 250; // 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 2 (b) line 4 (c) line 3 (d) line 1
15. 15.Which of these is processing? (a) typing your age (b) a buzz (vibration) (c) checking a password (d) a beep sound
16. 16.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let bill = 45; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.True or false: a beep sound is an output. (a) True (b) False
19. 19.True or false: a pop-up message is an output. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) a beep sound (d) a result on screen
21. 21.⚙️ What number does this app show?
    let bill = 20; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
23. 23.True or false: tapping a button is an input. (a) True (b) False
24. 24.⚙️ 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);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
26. 26.Which of these is an output? (a) a buzz (vibration) (b) working out a tip (c) tapping a button (d) speaking a command
27. 27.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a pop-up message (d) taking a photo
28. 28.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 1 (b) line 2 (c) line 3 (d) line 4
31. 31.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
32. 32.True or false: checking a password is processing. (a) True (b) False
33. 33.True or false: sorting the scores is processing. (a) True (b) False
34. 34.Which of these is processing? (a) speaking a command (b) taking a photo (c) sorting the scores (d) a buzz (vibration)
35. 35.🔍 Which is the odd one out? (a) working out a tip (b) a result on screen (c) sorting the scores (d) adding up a bill
36. 36.True or false: typing your age is an input. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
39. 39.True or false: tapping a button is processing. (a) False (b) True
40. 40.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);

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