App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 95 · 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: typing your age is an input. (a) True (b) False
2. 2.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ What number does this app show?
   let km = 2; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.⚙️ What number does this app show?
   let price = 240; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ What number does this app show?
   let km = 14; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
8. 8.True or false: a pop-up message is an output. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let bill = 104; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.True or false: a pop-up message is processing. (a) True (b) False
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 4 (b) line 2 (c) line 3 (d) line 1
12. 12.Which of these is an input? (a) working out a tip (b) sorting the scores (c) speaking a command (d) a result on screen
13. 13.Which of these is an input? (a) working out a tip (b) a buzz (vibration) (c) sorting the scores (d) tapping a button
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 3 (c) line 4 (d) line 1
15. 15.Which of these is an output? (a) checking a password (b) a buzz (vibration) (c) typing your age (d) working out a tip
16. 16.True or false: adding up a bill is an input. (a) True (b) False
17. 17.Which of these is processing? (a) a beep sound (b) adding up a bill (c) tapping a button (d) a pop-up message
18. 18.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
20. 20.True or false: speaking a command is processing. (a) False (b) True
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 4 (c) line 2 (d) line 3
22. 22.True or false: a beep sound is an input. (a) False (b) True
23. 23.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) taking a photo (d) typing your age
25. 25.Which of these is processing? (a) working out a tip (b) a beep sound (c) taking a photo (d) typing your age
26. 26.🔍 Which is the odd one out? (a) speaking a command (b) a buzz (vibration) (c) typing your age (d) tapping a button
27. 27.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a pop-up message (d) sorting the scores
28. 28.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) sorting the scores (d) checking a password
29. 29.True or false: taking a photo is an input. (a) False (b) True
30. 30.⚙️ What number does this app show?
    let bill = 94; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
32. 32.Which of these is an input? (a) typing your age (b) a pop-up message (c) adding up a bill (d) a result on screen
33. 33.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) speaking a command (d) a result on screen
34. 34.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) a result on screen (d) checking a password
35. 35.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
36. 36.True or false: typing your age is an output. (a) False (b) True
37. 37.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
38. 38.True or false: sorting the scores is processing. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) adding up a bill (d) speaking a command
40. 40.True or false: taking a photo is an output. (a) True (b) False

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