App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 923 · 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 result on screen is an input. (a) False (b) True
2. 2.⚙️ 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);
3. 3.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
4. 4.True or false: a pop-up message is an output. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a buzz (vibration) (b) tapping a button (c) typing your age (d) taking a photo
6. 6.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a pop-up message (d) typing your age
7. 7.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a pop-up message (d) tapping a button
8. 8.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 450; // 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 3 (c) line 4 (d) line 1
10. 10.Which of these is an output? (a) a result on screen (b) tapping a button (c) adding up a bill (d) taking a photo
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 108; // 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 1 (b) line 3 (c) line 2 (d) line 4
12. 12.True or false: typing your age is processing. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a pop-up message (b) adding up a bill (c) a beep sound (d) a result on screen
14. 14.True or false: adding up a bill is an input. (a) False (b) True
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // 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 1 (b) line 4 (c) line 2 (d) line 3
16. 16.True or false: taking a photo is processing. (a) False (b) True
17. 17.Which of these is an input? (a) working out a tip (b) sorting the scores (c) checking a password (d) speaking a command
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 2 (b) line 4 (c) line 3 (d) line 1
19. 19.Which of these is processing? (a) tapping a button (b) taking a photo (c) a buzz (vibration) (d) sorting the scores
20. 20.True or false: a pop-up message is processing. (a) True (b) False
21. 21.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
22. 22.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
23. 23.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) a result on screen
24. 24.Which of these is an input? (a) checking a password (b) typing your age (c) working out a tip (d) sorting the scores
25. 25.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
26. 26.True or false: checking a password is an input. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 52; // 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 1 (c) line 4 (d) line 3
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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
29. 29.Which of these is an output? (a) speaking a command (b) a buzz (vibration) (c) checking a password (d) adding up a bill
30. 30.True or false: a buzz (vibration) is an output. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) speaking a command (d) a beep sound
32. 32.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) typing your age (d) tapping a button
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 3 (b) line 4 (c) line 2 (d) line 1
34. 34.⚙️ What number does this app show?
    let bill = 20; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 140; // 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 2 (b) line 1 (c) line 4 (d) line 3
37. 37.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
39. 39.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) taking a photo (d) tapping a button
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // 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 1 (c) line 2 (d) line 3

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