App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 299 · 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) taking a photo (b) checking a password (c) a buzz (vibration) (d) speaking a command
2. 2.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
3. 3.Which of these is an input? (a) taking a photo (b) working out a tip (c) checking a password (d) a buzz (vibration)
4. 4.True or false: a result on screen is an input. (a) True (b) False
5. 5.Which of these is an output? (a) sorting the scores (b) speaking a command (c) checking a password (d) a pop-up message
6. 6.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
7. 7.⚙️ 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);
8. 8.True or false: checking a password is an output. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) speaking a command
10. 10.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.True or false: taking a photo is processing. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) typing your age
13. 13.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
14. 14.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
15. 15.True or false: a result on screen is an output. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a beep sound (d) working out a tip
17. 17.Which of these is processing? (a) working out a tip (b) a buzz (vibration) (c) a pop-up message (d) speaking a command
18. 18.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
19. 19.Which of these is processing? (a) tapping a button (b) a beep sound (c) adding up a bill (d) taking a photo
20. 20.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a result on screen (d) tapping a button
24. 24.⚙️ What number does this app show?
    let bill = 80; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 4 (b) line 2 (c) line 1 (d) line 3
27. 27.Which of these is processing? (a) a buzz (vibration) (b) a result on screen (c) typing your age (d) sorting the scores
28. 28.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.Which of these is an input? (a) speaking a command (b) a beep sound (c) adding up a bill (d) a pop-up message
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 201; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 4 (c) line 2 (d) line 1
31. 31.Which of these is an input? (a) checking a password (b) typing your age (c) a pop-up message (d) sorting the scores
32. 32.⚙️ What number does this app show?
    let bill = 90; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.⚙️ What number does this app show?
    let bill = 390; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.True or false: tapping a button is an input. (a) True (b) False
35. 35.⚙️ 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 1 (b) line 3 (c) line 2
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 1 (c) line 4 (d) line 2
37. 37.True or false: adding up a bill is processing. (a) False (b) True
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
39. 39.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
40. 40.⚙️ What number does this app show?
    let bill = 66; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);

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