App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 544 · 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 is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a result on screen (d) tapping a button
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 90; // 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 1 (c) line 3 (d) line 4
3. 3.Which of these is an output? (a) working out a tip (b) taking a photo (c) a buzz (vibration) (d) checking a password
4. 4.Which of these is an input? (a) a buzz (vibration) (b) working out a tip (c) taking a photo (d) checking a password
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // 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 1 (b) line 3 (c) line 4 (d) line 2
6. 6.Which of these is an input? (a) sorting the scores (b) a buzz (vibration) (c) speaking a command (d) adding up a bill
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 276; // typed by the user
   line 2: let friends = 4; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 2 (b) line 3 (c) line 1 (d) line 4
8. 8.True or false: speaking a command is an input. (a) False (b) True
9. 9.True or false: tapping a button is an input. (a) False (b) True
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 99; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 2 (c) line 3 (d) line 1
11. 11.Which of these is processing? (a) working out a tip (b) tapping a button (c) a buzz (vibration) (d) a result on screen
12. 12.⚙️ What number does this app show?
    let bill = 114; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
14. 14.Which of these is processing? (a) a result on screen (b) sorting the scores (c) typing your age (d) tapping a button
15. 15.Which of these is an input? (a) tapping a button (b) sorting the scores (c) a beep sound (d) a buzz (vibration)
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 3 (c) line 4 (d) line 1
17. 17.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
19. 19.True or false: a result on screen is an output. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) a beep sound (d) typing your age
21. 21.🔍 Which is the odd one out? (a) a beep sound (b) working out a tip (c) sorting the scores (d) adding up a bill
22. 22.Which of these is processing? (a) a pop-up message (b) adding up a bill (c) a beep sound (d) a result on screen
23. 23.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
24. 24.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 1 (b) line 3 (c) line 4 (d) line 2
26. 26.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
28. 28.⚙️ 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);
29. 29.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 85; // 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 4 (c) line 2 (d) line 3
31. 31.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
32. 32.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) sorting the scores
34. 34.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
36. 36.🔍 Which is the odd one out? (a) working out a tip (b) a buzz (vibration) (c) sorting the scores (d) adding up a bill
37. 37.True or false: sorting the scores is an output. (a) True (b) False
38. 38.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
39. 39.True or false: a buzz (vibration) is an output. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) adding up a bill (b) a result on screen (c) working out a tip (d) checking a password

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