App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 771 · 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 pop-up message is an output. (a) True (b) False
2. 2.⚙️ What number does this app show?
   let bill = 150; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ What number does this app show?
   let price = 460; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) sorting the scores (d) adding up a bill
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 180; // 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 4 (b) line 1 (c) line 3 (d) line 2
6. 6.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
7. 7.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
8. 8.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
9. 9.Which of these is an input? (a) taking a photo (b) a beep sound (c) working out a tip (d) adding up a bill
10. 10.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
11. 11.True or false: adding up a bill is processing. (a) True (b) False
12. 12.True or false: a result on screen is an input. (a) True (b) False
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 4 (b) line 3 (c) line 1 (d) line 2
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 215; // typed by the user
    line 2: let friends = 5; // 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
15. 15.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
16. 16.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 4 (b) line 2 (c) line 3 (d) line 1
18. 18.⚙️ What number does this app show?
    let bill = 82; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
20. 20.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) adding up a bill (d) working out a tip
21. 21.⚙️ 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 3 (b) line 2 (c) line 1 (d) line 4
22. 22.True or false: taking a photo is an output. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) sorting the scores (d) adding up a bill
24. 24.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) tapping a button (d) taking a photo
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 2 (c) line 3 (d) line 1
26. 26.True or false: checking a password is an input. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) speaking a command (d) a result on screen
28. 28.Which of these is processing? (a) typing your age (b) speaking a command (c) taking a photo (d) checking a password
29. 29.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.Which of these is an input? (a) adding up a bill (b) a buzz (vibration) (c) tapping a button (d) checking a password
31. 31.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.Which of these is processing? (a) tapping a button (b) a pop-up message (c) sorting the scores (d) taking a photo
33. 33.🔍 Which is the odd one out? (a) a pop-up message (b) sorting the scores (c) a beep sound (d) a result on screen
34. 34.⚙️ 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 1 (b) line 2 (c) line 3
35. 35.⚙️ 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 3 (b) line 2 (c) line 1
36. 36.True or false: sorting the scores is an input. (a) True (b) False
37. 37.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
38. 38.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
39. 39.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) taking a photo (d) a pop-up message
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 330; // 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 4 (b) line 2 (c) line 1 (d) line 3

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