App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 172 · 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 bill = 156; // 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 2 (b) line 1 (c) line 3 (d) line 4
2. 2.True or false: adding up a bill is an output. (a) True (b) False
3. 3.Which of these is an output? (a) sorting the scores (b) a pop-up message (c) working out a tip (d) typing your age
4. 4.Which of these is an input? (a) taking a photo (b) working out a tip (c) checking a password (d) adding up a bill
5. 5.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
6. 6.🔍 Which is the odd one out? (a) a beep sound (b) speaking a command (c) taking a photo (d) typing your age
7. 7.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) tapping a button (d) adding up a bill
8. 8.True or false: a beep sound is processing. (a) True (b) False
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 150; // typed by the user
   line 2: let off = 40; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 4 (b) line 3 (c) line 1 (d) line 2
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
11. 11.⚙️ 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);
12. 12.True or false: speaking a command is an input. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) typing your age (d) a pop-up message
14. 14.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
15. 15.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
16. 16.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
18. 18.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
19. 19.True or false: typing your age is processing. (a) False (b) True
20. 20.True or false: a pop-up message is an input. (a) True (b) False
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 395; // 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 4 (c) line 3 (d) line 2
22. 22.True or false: a pop-up message is an output. (a) True (b) False
23. 23.True or false: tapping a button is an input. (a) True (b) False
24. 24.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 93; // 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 4 (d) line 3
26. 26.True or false: sorting the scores is an input. (a) False (b) True
27. 27.⚙️ 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);
28. 28.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) speaking a command (d) working out a tip
29. 29.Which of these is an input? (a) adding up a bill (b) a result on screen (c) a buzz (vibration) (d) tapping a button
30. 30.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
31. 31.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 48; // 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 4 (b) line 2 (c) line 3 (d) line 1
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 4 (b) line 2 (c) line 3 (d) line 1
34. 34.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
36. 36.True or false: typing your age is an input. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let bill = 165; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
39. 39.Which of these is an input? (a) typing your age (b) checking a password (c) sorting the scores (d) a beep sound
40. 40.True or false: sorting the scores is processing. (a) False (b) True

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