App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 808 · 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 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 2 (b) line 1 (c) line 3
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 580; // 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 2 (b) line 4 (c) line 3 (d) line 1
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 25; // typed by the user
   line 2: let qty = 3; // 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
4. 4.⚙️ What number does this app show?
   let price = 30; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
5. 5.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a buzz (vibration)
6. 6.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
7. 7.⚙️ 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 4 (b) line 2 (c) line 1 (d) line 3
8. 8.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
9. 9.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.True or false: tapping a button is processing. (a) False (b) True
12. 12.Which of these is an output? (a) speaking a command (b) a beep sound (c) tapping a button (d) sorting the scores
13. 13.True or false: tapping a button is an output. (a) True (b) False
14. 14.Which of these is processing? (a) a result on screen (b) taking a photo (c) speaking a command (d) sorting the scores
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 3 (c) line 4 (d) line 1
16. 16.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) adding up a bill (d) checking a password
17. 17.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
19. 19.True or false: a pop-up message is an output. (a) True (b) False
20. 20.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
21. 21.True or false: sorting the scores is an output. (a) False (b) True
22. 22.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
25. 25.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 2 (b) line 3 (c) line 4 (d) line 1
27. 27.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) taking a photo (d) working out a tip
28. 28.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) working out a tip (d) sorting the scores
29. 29.⚙️ What number does this app show?
    let bill = 204; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
32. 32.Which of these is an input? (a) taking a photo (b) a beep sound (c) adding up a bill (d) a pop-up message
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 3 (c) line 4 (d) line 1
34. 34.True or false: sorting the scores is processing. (a) True (b) False
35. 35.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) speaking a command (d) checking a password
37. 37.⚙️ What number does this app show?
    let price = 550; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
40. 40.True or false: speaking a command is an output. (a) False (b) True

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students