App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 877 · 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 processing. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 15; // 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 3 (b) line 1 (c) line 4 (d) line 2
4. 4.⚙️ What number does this app show?
   let price = 140; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 4; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
6. 6.True or false: tapping a button is an output. (a) True (b) False
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
8. 8.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
9. 9.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) adding up a bill (d) typing your age
10. 10.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) a result on screen (d) a pop-up message
11. 11.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
12. 12.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
13. 13.True or false: a pop-up message is processing. (a) True (b) False
14. 14.Which of these is an output? (a) a buzz (vibration) (b) tapping a button (c) typing your age (d) speaking a command
15. 15.True or false: a result on screen is an output. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) sorting the scores (d) a pop-up message
17. 17.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) adding up a bill (d) working out a tip
18. 18.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a result on screen
19. 19.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
21. 21.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) taking a photo (d) a beep sound
22. 22.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
23. 23.Which of these is processing? (a) taking a photo (b) a result on screen (c) a buzz (vibration) (d) checking a password
24. 24.⚙️ 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 1 (c) line 3
25. 25.Which of these is an input? (a) a beep sound (b) typing your age (c) a pop-up message (d) working out a tip
26. 26.True or false: checking a password is an output. (a) True (b) False
27. 27.Which of these is an input? (a) tapping a button (b) checking a password (c) adding up a bill (d) a beep sound
28. 28.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
29. 29.⚙️ What number does this app show?
    let price = 120; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.⚙️ What number does this app show?
    let bill = 240; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) a pop-up message
32. 32.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) typing your age (d) speaking a command
33. 33.True or false: taking a photo is processing. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.True or false: sorting the scores is an input. (a) False (b) True
36. 36.True or false: typing your age is processing. (a) True (b) False
37. 37.True or false: speaking a command is an output. (a) False (b) True
38. 38.Which of these is an output? (a) checking a password (b) sorting the scores (c) a result on screen (d) taking a photo
39. 39.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) speaking a command (d) a buzz (vibration)
40. 40.Which of these is processing? (a) adding up a bill (b) a buzz (vibration) (c) speaking a command (d) typing your age

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