App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 243 · 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 input? (a) a beep sound (b) a result on screen (c) speaking a command (d) a buzz (vibration)
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 52; // 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 4 (b) line 3 (c) line 2 (d) line 1
3. 3.⚙️ What number does this app show?
   let price = 240; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 15; // typed by the user
   line 2: let qty = 4; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 3 (b) line 4 (c) line 1 (d) line 2
5. 5.⚙️ 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 1 (b) line 2 (c) line 3
6. 6.True or false: typing your age is an output. (a) True (b) False
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 30; // 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 3 (b) line 2 (c) line 1 (d) line 4
8. 8.🔍 Which is the odd one out? (a) checking a password (b) a beep sound (c) a buzz (vibration) (d) a result on screen
9. 9.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) working out a tip (d) a beep sound
10. 10.Which of these is an output? (a) a result on screen (b) speaking a command (c) working out a tip (d) adding up a bill
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 390; // 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 3 (b) line 1 (c) line 4 (d) line 2
12. 12.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) a buzz (vibration) (d) tapping a button
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.True or false: working out a tip is an output. (a) True (b) False
15. 15.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
16. 16.True or false: tapping a button is an output. (a) False (b) True
17. 17.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
18. 18.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) a pop-up message (d) a result on screen
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
21. 21.Which of these is an input? (a) a result on screen (b) sorting the scores (c) tapping a button (d) checking a password
22. 22.Which of these is an output? (a) a beep sound (b) working out a tip (c) typing your age (d) sorting the scores
23. 23.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
24. 24.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.Which of these is processing? (a) a beep sound (b) a result on screen (c) working out a tip (d) a buzz (vibration)
26. 26.Which of these is an output? (a) a pop-up message (b) sorting the scores (c) adding up a bill (d) checking a password
27. 27.🔍 Which is the odd one out? (a) tapping a button (b) sorting the scores (c) typing your age (d) taking a photo
28. 28.Which of these is an output? (a) taking a photo (b) a buzz (vibration) (c) tapping a button (d) checking a password
29. 29.True or false: a result on screen is processing. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a result on screen (b) sorting the scores (c) checking a password (d) adding up a bill
31. 31.True or false: speaking a command is an output. (a) True (b) False
32. 32.Which of these is an input? (a) typing your age (b) a pop-up message (c) a buzz (vibration) (d) adding up a bill
33. 33.🔍 Which is the odd one out? (a) working out a tip (b) a buzz (vibration) (c) a beep sound (d) a pop-up message
34. 34.Which of these is processing? (a) typing your age (b) sorting the scores (c) taking a photo (d) speaking a command
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 550; // 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 2 (b) line 3 (c) line 4 (d) line 1
36. 36.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
38. 38.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
40. 40.Which of these is processing? (a) adding up a bill (b) a buzz (vibration) (c) taking a photo (d) tapping a button

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