App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 386 · 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) checking a password (b) tapping a button (c) typing your age (d) speaking a command
2. 2.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
3. 3.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) a beep sound (d) a result on screen
4. 4.🔍 Which is the odd one out? (a) a pop-up message (b) working out a tip (c) adding up a bill (d) sorting the scores
5. 5.Which of these is processing? (a) speaking a command (b) taking a photo (c) working out a tip (d) tapping a button
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 180; // 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 3 (d) line 1
7. 7.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
8. 8.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) working out a tip (d) speaking a command
9. 9.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 3 (b) line 2 (c) line 4 (d) line 1
11. 11.True or false: a beep sound is an input. (a) False (b) True
12. 12.Which of these is an output? (a) adding up a bill (b) typing your age (c) a result on screen (d) speaking a command
13. 13.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
14. 14.True or false: working out a tip is an input. (a) False (b) True
15. 15.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
16. 16.⚙️ 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);
17. 17.True or false: a buzz (vibration) is an input. (a) True (b) False
18. 18.Which of these is processing? (a) sorting the scores (b) a beep sound (c) a result on screen (d) tapping a button
19. 19.⚙️ 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 2 (c) line 1
20. 20.⚙️ 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);
21. 21.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
22. 22.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.Which of these is an input? (a) adding up a bill (b) a result on screen (c) a beep sound (d) typing your age
25. 25.Which of these is an input? (a) a pop-up message (b) a buzz (vibration) (c) speaking a command (d) sorting the scores
26. 26.Which of these is an output? (a) typing your age (b) a buzz (vibration) (c) working out a tip (d) speaking a command
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 4 (b) line 3 (c) line 1 (d) line 2
28. 28.Which of these is processing? (a) adding up a bill (b) a beep sound (c) speaking a command (d) a buzz (vibration)
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // typed by the user
    line 2: let qty = 3; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 4 (c) line 2 (d) line 1
30. 30.True or false: adding up a bill is an output. (a) True (b) False
31. 31.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) taking a photo (d) sorting the scores
33. 33.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ What number does this app show?
    let bill = 296; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 1 (b) line 4 (c) line 2 (d) line 3
37. 37.True or false: typing your age is an output. (a) True (b) False
38. 38.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
39. 39.True or false: a pop-up message is processing. (a) False (b) True
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2

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