App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 266 · 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 output? (a) tapping a button (b) typing your age (c) a beep sound (d) taking a photo
2. 2.⚙️ 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 2 (b) line 3 (c) line 1
3. 3.🔍 Which is the odd one out? (a) taking a photo (b) a result on screen (c) a buzz (vibration) (d) a pop-up message
4. 4.Which of these is an output? (a) sorting the scores (b) adding up a bill (c) a buzz (vibration) (d) speaking a command
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 2 (b) line 4 (c) line 3 (d) line 1
6. 6.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) a pop-up message (d) a buzz (vibration)
7. 7.True or false: a beep sound is an input. (a) True (b) False
8. 8.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
9. 9.True or false: typing your age is processing. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) a beep sound (d) typing your age
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 245; // 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 4 (d) line 1
12. 12.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.⚙️ What number does this app show?
    let bill = 104; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.🔍 Which is the odd one out? (a) speaking a command (b) sorting the scores (c) adding up a bill (d) working out a tip
15. 15.Which of these is an output? (a) checking a password (b) working out a tip (c) a pop-up message (d) sorting the scores
16. 16.True or false: a buzz (vibration) is an output. (a) False (b) True
17. 17.True or false: sorting the scores is an input. (a) True (b) False
18. 18.True or false: tapping a button is an input. (a) True (b) False
19. 19.True or false: taking a photo is an input. (a) True (b) False
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 95; // 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
21. 21.Which of these is an input? (a) sorting the scores (b) adding up a bill (c) checking a password (d) typing your age
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 84; // 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 3 (c) line 2 (d) line 4
23. 23.True or false: taking a photo is an output. (a) False (b) True
24. 24.True or false: a pop-up message is an output. (a) True (b) False
25. 25.Which of these is an input? (a) a result on screen (b) a buzz (vibration) (c) taking a photo (d) working out a tip
26. 26.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
27. 27.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) a buzz (vibration) (d) tapping a button
30. 30.True or false: tapping a button is processing. (a) False (b) True
31. 31.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
32. 32.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
33. 33.True or false: working out a tip is processing. (a) True (b) False
34. 34.Which of these is processing? (a) a beep sound (b) adding up a bill (c) a result on screen (d) speaking a command
35. 35.True or false: a beep sound is an output. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let bill = 128; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
38. 38.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.True or false: adding up a bill is processing. (a) False (b) True
40. 40.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);

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