App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 434 · 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 checking a password an input, processing or an output? (a) processing (b) output (c) input
2. 2.True or false: a pop-up message is processing. (a) True (b) False
3. 3.Which of these is processing? (a) a beep sound (b) tapping a button (c) a buzz (vibration) (d) checking a password
4. 4.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) a buzz (vibration)
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 390; // 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 2 (b) line 1 (c) line 3 (d) line 4
6. 6.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 30; // 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 4 (b) line 1 (c) line 2 (d) line 3
9. 9.⚙️ What number does this app show?
   let price = 470; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.🔍 Which is the odd one out? (a) a pop-up message (b) speaking a command (c) a beep sound (d) a buzz (vibration)
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
12. 12.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) tapping a button
13. 13.Which of these is an input? (a) adding up a bill (b) speaking a command (c) a result on screen (d) a beep sound
14. 14.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.Which of these is processing? (a) taking a photo (b) sorting the scores (c) tapping a button (d) a buzz (vibration)
16. 16.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) adding up a bill (d) typing your age
17. 17.⚙️ What number does this app show?
    let bill = 87; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.⚙️ What number does this app show?
    let bill = 171; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.True or false: taking a photo is an input. (a) True (b) False
20. 20.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 3 (b) line 4 (c) line 2 (d) line 1
22. 22.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) a buzz (vibration) (d) taking a photo
23. 23.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
24. 24.Which of these is an input? (a) a pop-up message (b) typing your age (c) a beep sound (d) checking a password
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 2 (b) line 1 (c) line 3 (d) line 4
26. 26.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a beep sound
27. 27.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
28. 28.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) taking a photo
29. 29.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
30. 30.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
31. 31.True or false: typing your age is an input. (a) False (b) True
32. 32.True or false: checking a password is an output. (a) True (b) False
33. 33.True or false: adding up a bill is processing. (a) True (b) False
34. 34.Which of these is processing? (a) a buzz (vibration) (b) tapping a button (c) adding up a bill (d) typing your age
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 1 (c) line 4 (d) line 3
36. 36.⚙️ 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);
37. 37.True or false: working out a tip is an output. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let bill = 175; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.True or false: typing your age is processing. (a) True (b) False
40. 40.True or false: speaking a command is an output. (a) True (b) False

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