App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 34 · 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 = 235; // 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 1 (c) line 4 (d) line 3
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 30; // 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 3 (c) line 2 (d) line 4
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 3 (b) line 1 (c) line 4 (d) line 2
4. 4.True or false: adding up a bill is an input. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 4 (c) line 2 (d) line 3
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 200; // typed by the user
   line 2: let off = 30; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 1 (b) line 2 (c) line 4 (d) line 3
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 55; // 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 4 (c) line 2 (d) line 3
8. 8.True or false: working out a tip is processing. (a) False (b) True
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 110; // 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 3 (b) line 1 (c) line 4 (d) line 2
10. 10.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) a buzz (vibration) (d) checking a password
11. 11.True or false: speaking a command is an input. (a) False (b) True
12. 12.Which of these is an output? (a) checking a password (b) tapping a button (c) a result on screen (d) speaking a command
13. 13.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) sorting the scores (d) working out a tip
14. 14.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) sorting the scores (d) typing your age
16. 16.Which of these is processing? (a) adding up a bill (b) a buzz (vibration) (c) a beep sound (d) speaking a command
17. 17.Which of these is an input? (a) typing your age (b) checking a password (c) adding up a bill (d) a beep sound
18. 18.⚙️ 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 1 (b) line 3 (c) line 2
19. 19.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) checking a password (d) a result on screen
20. 20.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) adding up a bill (d) typing your age
21. 21.True or false: checking a password is processing. (a) True (b) False
22. 22.True or false: typing your age is an input. (a) True (b) False
23. 23.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
24. 24.⚙️ 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 2 (b) line 1 (c) line 4 (d) line 3
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // 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 2 (b) line 1 (c) line 3 (d) line 4
26. 26.True or false: tapping a button is processing. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) a beep sound (d) tapping a button
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 120; // 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 1 (c) line 4 (d) line 3
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 370; // 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 2 (c) line 3 (d) line 1
30. 30.🔍 Which is the odd one out? (a) a pop-up message (b) working out a tip (c) a beep sound (d) a result on screen
31. 31.⚙️ 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 1 (c) line 3
32. 32.⚙️ What number does this app show?
    let bill = 300; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) typing your age (d) tapping a button
34. 34.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
35. 35.Which of these is processing? (a) typing your age (b) checking a password (c) taking a photo (d) a beep sound
36. 36.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.True or false: a buzz (vibration) is an input. (a) False (b) True
38. 38.True or false: taking a photo is an output. (a) True (b) False
39. 39.Which of these is an input? (a) taking a photo (b) sorting the scores (c) a beep sound (d) adding up a bill
40. 40.⚙️ 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 1 (c) line 4 (d) line 3

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