App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 282 · 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 of these is an output? (a) adding up a bill (b) speaking a command (c) tapping a button (d) a result on screen
2. 2.⚙️ What number does this app show?
   let price = 390; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) speaking a command (d) checking a password
4. 4.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
5. 5.⚙️ 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);
6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
7. 7.🔍 Which is the odd one out? (a) working out a tip (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
8. 8.True or false: sorting the scores is an output. (a) True (b) False
9. 9.⚙️ 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 3 (b) line 4 (c) line 1 (d) line 2
10. 10.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 3 (c) line 2 (d) line 1
12. 12.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) tapping a button (d) a buzz (vibration)
13. 13.True or false: speaking a command is an input. (a) False (b) True
14. 14.True or false: taking a photo is an input. (a) True (b) False
15. 15.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
16. 16.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
17. 17.True or false: tapping a button is an output. (a) True (b) False
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // 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 2 (b) line 3 (c) line 4 (d) line 1
19. 19.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.True or false: speaking a command is processing. (a) True (b) False
21. 21.True or false: working out a tip is processing. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) a beep sound
23. 23.True or false: adding up a bill is processing. (a) False (b) True
24. 24.Which of these is processing? (a) working out a tip (b) speaking a command (c) a result on screen (d) tapping a button
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
26. 26.⚙️ What number does this app show?
    let bill = 51; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.True or false: a result on screen is an output. (a) False (b) True
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 370; // 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 4 (b) line 1 (c) line 3 (d) line 2
29. 29.True or false: a pop-up message is an input. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) a buzz (vibration) (d) typing your age
31. 31.Which of these is processing? (a) sorting the scores (b) a result on screen (c) typing your age (d) a beep sound
32. 32.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
33. 33.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
34. 34.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
35. 35.True or false: a buzz (vibration) is an output. (a) False (b) True
36. 36.True or false: typing your age is processing. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) a beep sound (b) taking a photo (c) a buzz (vibration) (d) a result on screen
38. 38.True or false: a result on screen is processing. (a) True (b) False
39. 39.True or false: taking a photo is an output. (a) True (b) False
40. 40.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);

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