App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 260 · 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.True or false: a buzz (vibration) is an input. (a) True (b) False
2. 2.⚙️ 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 1 (b) line 3 (c) line 2
3. 3.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) a buzz (vibration) (d) a result on screen
4. 4.Which of these is processing? (a) tapping a button (b) adding up a bill (c) taking a photo (d) speaking a command
5. 5.⚙️ 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 4 (c) line 3 (d) line 2
6. 6.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) adding up a bill (d) taking a photo
8. 8.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
9. 9.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) a beep sound
10. 10.True or false: a beep sound is an input. (a) True (b) False
11. 11.True or false: working out a tip is processing. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) a buzz (vibration) (d) adding up a bill
13. 13.Which of these is processing? (a) a buzz (vibration) (b) checking a password (c) a beep sound (d) taking a photo
14. 14.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
15. 15.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 152; // 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
17. 17.Which of these is an output? (a) checking a password (b) a result on screen (c) taking a photo (d) working out a tip
18. 18.True or false: speaking a command is an input. (a) False (b) True
19. 19.True or false: a pop-up message is an output. (a) True (b) False
20. 20.Which of these is processing? (a) a beep sound (b) a buzz (vibration) (c) a pop-up message (d) working out a tip
21. 21.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
22. 22.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) checking a password
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 154; // 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
24. 24.⚙️ In an app, is sorting the scores 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 price = 95; // 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 1 (c) line 3 (d) line 2
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 1 (b) line 2 (c) line 4 (d) line 3
27. 27.True or false: a buzz (vibration) is an output. (a) False (b) True
28. 28.True or false: a beep sound is processing. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a result on screen (d) sorting the scores
30. 30.True or false: tapping a button is an input. (a) False (b) True
31. 31.⚙️ What number does this app show?
    let bill = 164; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.Which of these is an input? (a) adding up a bill (b) a beep sound (c) speaking a command (d) a pop-up message
33. 33.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
34. 34.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
35. 35.Which of these is an output? (a) a beep sound (b) checking a password (c) speaking a command (d) typing your age
36. 36.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
37. 37.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) adding up a bill (d) working out a tip
38. 38.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
40. 40.Which of these is an input? (a) sorting the scores (b) a result on screen (c) adding up a bill (d) tapping a button

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