App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 557 · 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.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
2. 2.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) speaking a command (d) taking a photo
3. 3.Which of these is an output? (a) speaking a command (b) typing your age (c) a pop-up message (d) working out a tip
4. 4.Which of these is an input? (a) working out a tip (b) checking a password (c) tapping a button (d) sorting the scores
5. 5.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) speaking a command (d) taking a photo
6. 6.⚙️ What number does this app show?
   let bill = 64; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.⚙️ What number does this app show?
   let bill = 134; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 480; // 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 4 (b) line 3 (c) line 2 (d) line 1
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 85; // 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 1 (b) line 2 (c) line 3 (d) line 4
10. 10.🔍 Which is the odd one out? (a) speaking a command (b) sorting the scores (c) adding up a bill (d) working out a tip
11. 11.True or false: tapping a button is an output. (a) False (b) True
12. 12.True or false: speaking a command is an input. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a pop-up message (d) sorting the scores
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 260; // 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 4 (b) line 1 (c) line 3 (d) line 2
15. 15.True or false: taking a photo is processing. (a) False (b) True
16. 16.⚙️ 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 2 (c) line 1
17. 17.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.True or false: taking a photo is an output. (a) False (b) True
19. 19.Which of these is processing? (a) a pop-up message (b) working out a tip (c) taking a photo (d) a result on screen
20. 20.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.True or false: tapping a button is an input. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) a beep sound
23. 23.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
24. 24.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 69; // 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 4 (d) line 1
26. 26.Which of these is processing? (a) sorting the scores (b) taking a photo (c) a buzz (vibration) (d) a result on screen
27. 27.⚙️ 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
28. 28.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
29. 29.Which of these is processing? (a) adding up a bill (b) taking a photo (c) a pop-up message (d) a buzz (vibration)
30. 30.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) a pop-up message (d) adding up a bill
31. 31.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) taking a photo (d) typing your age
32. 32.True or false: a beep sound is processing. (a) True (b) False
33. 33.True or false: a result on screen is processing. (a) False (b) True
34. 34.⚙️ 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 1 (b) line 2 (c) line 3 (d) line 4
35. 35.True or false: taking a photo is an input. (a) False (b) True
36. 36.True or false: a beep sound is an output. (a) False (b) True
37. 37.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) adding up a bill (d) speaking a command
38. 38.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
39. 39.True or false: working out a tip is processing. (a) True (b) False
40. 40.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input

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