App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 64 · 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 is the odd one out? (a) sorting the scores (b) taking a photo (c) checking a password (d) working out a tip
2. 2.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) speaking a command (d) checking a password
3. 3.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) a buzz (vibration) (d) a result on screen
4. 4.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.True or false: a pop-up message is an input. (a) True (b) False
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 10; // 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
7. 7.True or false: a beep sound is an output. (a) False (b) True
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 12; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
9. 9.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) adding up a bill (d) checking a password
10. 10.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
11. 11.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) checking a password (d) sorting the scores
12. 12.Which of these is an output? (a) tapping a button (b) taking a photo (c) working out a tip (d) a buzz (vibration)
13. 13.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) checking a password (d) a pop-up message
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 36; // 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
15. 15.⚙️ 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 3 (b) line 2 (c) line 4 (d) line 1
16. 16.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
17. 17.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
19. 19.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) speaking a command (d) working out a tip
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 3 (b) line 4 (c) line 1 (d) line 2
22. 22.Which of these is an input? (a) sorting the scores (b) typing your age (c) adding up a bill (d) a result on screen
23. 23.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
24. 24.⚙️ What number does this app show?
    let bill = 138; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.Which of these is an output? (a) taking a photo (b) sorting the scores (c) typing your age (d) a result on screen
26. 26.True or false: a result on screen is an output. (a) False (b) True
27. 27.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
28. 28.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
30. 30.True or false: taking a photo is processing. (a) False (b) True
31. 31.True or false: a beep sound is processing. (a) True (b) False
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 230; // 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 2 (c) line 1 (d) line 3
33. 33.Which of these is an input? (a) working out a tip (b) a beep sound (c) a pop-up message (d) speaking a command
34. 34.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) a result on screen (d) sorting the scores
36. 36.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
37. 37.True or false: a pop-up message is an output. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
40. 40.Which of these is an output? (a) a beep sound (b) working out a tip (c) speaking a command (d) tapping a button

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