App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 494 · 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 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 1 (b) line 2 (c) line 3
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 22; // 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 2 (b) line 4 (c) line 3 (d) line 1
3. 3.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) adding up a bill (d) working out a tip
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 340; // 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 3 (b) line 2 (c) line 1 (d) line 4
5. 5.Which of these is processing? (a) a beep sound (b) checking a password (c) taking a photo (d) typing your age
6. 6.True or false: tapping a button is an output. (a) True (b) False
7. 7.True or false: taking a photo is an output. (a) False (b) True
8. 8.Which of these is an input? (a) a pop-up message (b) sorting the scores (c) a beep sound (d) typing your age
9. 9.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
10. 10.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
11. 11.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
12. 12.Which of these is processing? (a) working out a tip (b) tapping a button (c) a pop-up message (d) a buzz (vibration)
13. 13.True or false: speaking a command is an output. (a) True (b) False
14. 14.⚙️ What number does this app show?
    let bill = 138; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
16. 16.Which of these is an input? (a) sorting the scores (b) working out a tip (c) adding up a bill (d) taking a photo
17. 17.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) a pop-up message (d) checking a password
18. 18.True or false: working out a tip is processing. (a) True (b) False
19. 19.True or false: a beep sound is processing. (a) False (b) True
20. 20.⚙️ What number does this app show?
    let bill = 140; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.True or false: adding up a bill is processing. (a) False (b) True
22. 22.Which of these is processing? (a) tapping a button (b) typing your age (c) a result on screen (d) adding up a bill
23. 23.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) adding up a bill (d) checking a password
24. 24.Which of these is an input? (a) working out a tip (b) a beep sound (c) a result on screen (d) speaking a command
25. 25.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // typed by the user
    line 2: let qty = 2; // 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
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 530; // 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 2 (c) line 1 (d) line 4
28. 28.Which of these is an input? (a) a buzz (vibration) (b) tapping a button (c) sorting the scores (d) adding up a bill
29. 29.⚙️ What number does this app show?
    let bill = 292; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) working out a tip
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 4 (c) line 3 (d) line 2
32. 32.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) adding up a bill (d) a result on screen
33. 33.True or false: checking a password is processing. (a) True (b) False
34. 34.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
35. 35.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
37. 37.Which of these is an output? (a) sorting the scores (b) a buzz (vibration) (c) taking a photo (d) adding up a bill
38. 38.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);

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