App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 372 · 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) a beep sound (b) speaking a command (c) checking a password (d) taking a photo
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 128; // 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 2 (d) line 4
3. 3.Which of these is an output? (a) taking a photo (b) speaking a command (c) adding up a bill (d) a result on screen
4. 4.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
5. 5.⚙️ What number does this app show?
   let bill = 76; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.True or false: a buzz (vibration) is an output. (a) True (b) False
7. 7.⚙️ 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 1 (b) line 3 (c) line 2
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 420; // 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 3 (c) line 4 (d) line 2
9. 9.⚙️ What number does this app show?
   let km = 8; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
11. 11.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
12. 12.Which of these is an output? (a) speaking a command (b) sorting the scores (c) typing your age (d) a pop-up message
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 4 (b) line 3 (c) line 1 (d) line 2
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // 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 4 (b) line 3 (c) line 1 (d) line 2
15. 15.Which of these is processing? (a) a beep sound (b) a pop-up message (c) typing your age (d) working out a tip
16. 16.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) tapping a button
17. 17.Which of these is an input? (a) speaking a command (b) working out a tip (c) checking a password (d) a beep sound
18. 18.True or false: a result on screen is an output. (a) True (b) False
19. 19.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.True or false: a beep sound is processing. (a) False (b) True
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 3 (c) line 1 (d) line 2
22. 22.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) adding up a bill
23. 23.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
24. 24.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) a pop-up message (d) a buzz (vibration)
25. 25.True or false: speaking a command is an input. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ What number does this app show?
    let bill = 225; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.True or false: checking a password is processing. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let bill = 80; // 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) adding up a bill (b) working out a tip (c) taking a photo (d) checking a password
31. 31.🔍 Which is the odd one out? (a) working out a tip (b) tapping a button (c) speaking a command (d) taking a photo
32. 32.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) working out a tip (c) sorting the scores (d) checking a password
34. 34.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.Which of these is an input? (a) a pop-up message (b) working out a tip (c) tapping a button (d) adding up a bill
36. 36.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.Which of these is processing? (a) a buzz (vibration) (b) sorting the scores (c) typing your age (d) tapping a button
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 63; // 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 4 (c) line 2 (d) line 3
39. 39.True or false: adding up a bill is processing. (a) True (b) False
40. 40.Which of these is processing? (a) adding up a bill (b) a beep sound (c) a result on screen (d) a buzz (vibration)

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