App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 270 · 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) input (b) processing (c) output
2. 2.True or false: a beep sound is processing. (a) True (b) False
3. 3.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
4. 4.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
5. 5.True or false: checking a password is processing. (a) False (b) True
6. 6.⚙️ What number does this app show?
   let price = 15; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
8. 8.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) a buzz (vibration) (d) adding up a bill
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 50; // typed by the user
   line 2: let qty = 6; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 4 (b) line 1 (c) line 2 (d) line 3
10. 10.Which of these is an output? (a) working out a tip (b) tapping a button (c) typing your age (d) a beep sound
11. 11.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) a beep sound (d) typing your age
12. 12.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) typing your age (d) taking a photo
13. 13.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) a buzz (vibration) (d) a beep sound
14. 14.True or false: tapping a button is processing. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a pop-up message (b) speaking a command (c) a beep sound (d) a buzz (vibration)
16. 16.True or false: a beep sound is an output. (a) False (b) True
17. 17.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) taking a photo (d) a buzz (vibration)
19. 19.True or false: sorting the scores is an output. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) speaking a command (d) taking a photo
21. 21.⚙️ 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
22. 22.Which of these is an output? (a) tapping a button (b) taking a photo (c) a result on screen (d) adding up a bill
23. 23.True or false: sorting the scores is processing. (a) False (b) True
24. 24.True or false: a buzz (vibration) is an input. (a) True (b) False
25. 25.Which of these is an input? (a) working out a tip (b) a result on screen (c) speaking a command (d) checking a password
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
27. 27.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) working out a tip
28. 28.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) a result on screen (d) typing your age
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 276; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 2 (c) line 4 (d) line 3
30. 30.⚙️ 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 3 (c) line 2 (d) line 4
31. 31.⚙️ What number does this app show?
    let price = 350; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.Which of these is an input? (a) sorting the scores (b) adding up a bill (c) tapping a button (d) a beep sound
33. 33.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // 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 1 (b) line 4 (c) line 2 (d) line 3
35. 35.Which of these is an output? (a) speaking a command (b) tapping a button (c) a pop-up message (d) working out a tip
36. 36.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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
38. 38.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.True or false: typing your age is an output. (a) False (b) True
40. 40.Which of these is an input? (a) checking a password (b) a beep sound (c) typing your age (d) sorting the scores

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