App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 628 · 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.⚙️ What number does this app show?
   let price = 540; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.Which of these is processing? (a) sorting the scores (b) typing your age (c) speaking a command (d) a result on screen
3. 3.⚙️ What number does this app show?
   let km = 2; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) taking a photo (d) tapping a button
5. 5.Which of these is processing? (a) a pop-up message (b) a beep sound (c) adding up a bill (d) a result on screen
6. 6.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a buzz (vibration)
7. 7.True or false: taking a photo is an input. (a) False (b) True
8. 8.⚙️ What number does this app show?
   let price = 120; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
10. 10.Which of these is processing? (a) a buzz (vibration) (b) a result on screen (c) typing your age (d) checking a password
11. 11.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) typing your age
12. 12.Which of these is an output? (a) typing your age (b) a pop-up message (c) speaking a command (d) tapping a button
13. 13.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
14. 14.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
15. 15.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.True or false: working out a tip is processing. (a) False (b) True
17. 17.Which of these is an output? (a) adding up a bill (b) typing your age (c) tapping a button (d) a result on screen
18. 18.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) adding up a bill (d) a beep sound
19. 19.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) adding up a bill (d) checking a password
20. 20.True or false: tapping a button is processing. (a) True (b) False
21. 21.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
22. 22.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) sorting the scores (d) tapping a button
23. 23.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ What number does this app show?
    let bill = 148; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) speaking a command (d) sorting the scores
26. 26.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
27. 27.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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
29. 29.True or false: tapping a button is an input. (a) True (b) False
30. 30.⚙️ What number does this app show?
    let bill = 108; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 2 (b) line 4 (c) line 3 (d) line 1
33. 33.⚙️ What number does this app show?
    let bill = 144; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
35. 35.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
36. 36.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
38. 38.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) taking a photo (d) working out a tip
39. 39.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 2 (d) line 4

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