App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 98 · 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 checking a password an input, processing or an output? (a) input (b) processing (c) output
2. 2.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
3. 3.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) a result on screen (d) a beep sound
4. 4.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
5. 5.True or false: sorting the scores is an output. (a) True (b) False
6. 6.Which of these is an output? (a) taking a photo (b) checking a password (c) a result on screen (d) speaking a command
7. 7.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) checking a password (d) typing your age
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 350; // 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 1 (d) line 3
9. 9.True or false: typing your age is processing. (a) True (b) False
10. 10.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
11. 11.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a pop-up message (d) working out a tip
12. 12.Which of these is an input? (a) typing your age (b) a pop-up message (c) a result on screen (d) adding up a bill
13. 13.True or false: a result on screen is an input. (a) True (b) False
14. 14.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
15. 15.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.True or false: tapping a button is an input. (a) False (b) True
17. 17.True or false: sorting the scores is processing. (a) True (b) False
18. 18.Which of these is an output? (a) a beep sound (b) working out a tip (c) speaking a command (d) sorting the scores
19. 19.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.True or false: taking a photo is processing. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.True or false: a result on screen is an output. (a) False (b) True
23. 23.Which of these is processing? (a) taking a photo (b) working out a tip (c) a buzz (vibration) (d) typing your age
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 310; // 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 3 (b) line 4 (c) line 2 (d) line 1
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
27. 27.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) adding up a bill (d) a pop-up message
28. 28.Which of these is processing? (a) adding up a bill (b) a beep sound (c) a buzz (vibration) (d) typing your age
29. 29.True or false: working out a tip is processing. (a) False (b) True
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 185; // 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 4 (b) line 2 (c) line 1 (d) line 3
31. 31.Which of these is an output? (a) typing your age (b) taking a photo (c) adding up a bill (d) a pop-up message
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 110; // 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 4 (c) line 1 (d) line 3
33. 33.🔍 Which is the odd one out? (a) typing your age (b) a beep sound (c) speaking a command (d) tapping a button
34. 34.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
35. 35.True or false: adding up a bill is an output. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) sorting the scores (d) a beep sound
37. 37.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 365; // 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 1 (b) line 2 (c) line 4 (d) line 3
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 105; // 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 3 (b) line 2 (c) line 4 (d) line 1
40. 40.True or false: taking a photo is an input. (a) True (b) False

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