App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 827 · 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 = 5; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
2. 2.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) taking a photo (d) tapping a button
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
4. 4.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
5. 5.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) taking a photo (d) a buzz (vibration)
6. 6.True or false: a pop-up message is processing. (a) True (b) False
7. 7.Which of these is an output? (a) taking a photo (b) adding up a bill (c) a beep sound (d) speaking a command
8. 8.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 510; // 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 3 (b) line 1 (c) line 4 (d) line 2
10. 10.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
11. 11.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.True or false: working out a tip is an input. (a) False (b) True
14. 14.True or false: typing your age is an input. (a) False (b) True
15. 15.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
16. 16.Which of these is processing? (a) tapping a button (b) speaking a command (c) sorting the scores (d) typing your age
17. 17.⚙️ What number does this app show?
    let bill = 146; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.True or false: speaking a command is processing. (a) False (b) True
19. 19.True or false: taking a photo is an output. (a) True (b) False
20. 20.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
22. 22.True or false: sorting the scores is processing. (a) True (b) False
23. 23.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
24. 24.⚙️ What number does this app show?
    let price = 320; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.Which of these is an input? (a) a buzz (vibration) (b) a pop-up message (c) sorting the scores (d) tapping a button
26. 26.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) taking a photo (d) typing your age
27. 27.True or false: a buzz (vibration) is an output. (a) True (b) False
28. 28.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.Which of these is an output? (a) a buzz (vibration) (b) sorting the scores (c) working out a tip (d) tapping a button
30. 30.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) typing your age (d) checking a password
31. 31.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 2 (b) line 3 (c) line 4 (d) line 1
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 100; // 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 4 (b) line 3 (c) line 2 (d) line 1
34. 34.Which of these is processing? (a) typing your age (b) a beep sound (c) a buzz (vibration) (d) checking a password
35. 35.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.Which of these is an input? (a) a beep sound (b) speaking a command (c) adding up a bill (d) a buzz (vibration)
37. 37.Which of these is processing? (a) adding up a bill (b) tapping a button (c) a beep sound (d) taking a photo
38. 38.⚙️ What number does this app show?
    let bill = 58; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.⚙️ 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 1 (b) line 3 (c) line 2
40. 40.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a beep sound (d) speaking a command

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