App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 192 · 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.⚙️ What number does this app show?
   let km = 11; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 248; // 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 3 (b) line 2 (c) line 1 (d) line 4
3. 3.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
4. 4.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) speaking a command (d) a pop-up message
5. 5.⚙️ What number does this app show?
   let bill = 370; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ What number does this app show?
   let price = 95; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
9. 9.🔍 Which is the odd one out? (a) sorting the scores (b) a beep sound (c) a pop-up message (d) a result on screen
10. 10.Which of these is processing? (a) speaking a command (b) working out a tip (c) a beep sound (d) typing your age
11. 11.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 2 (c) line 4 (d) line 1
13. 13.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
14. 14.Which of these is an input? (a) a pop-up message (b) tapping a button (c) a result on screen (d) checking a password
15. 15.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) a result on screen (d) sorting the scores
16. 16.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) checking a password (d) working out a tip
17. 17.Which of these is processing? (a) taking a photo (b) speaking a command (c) a pop-up message (d) checking a password
18. 18.Which of these is an input? (a) working out a tip (b) adding up a bill (c) taking a photo (d) a buzz (vibration)
19. 19.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) adding up a bill
21. 21.Which of these is processing? (a) taking a photo (b) a beep sound (c) adding up a bill (d) speaking a command
22. 22.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) checking a password (d) a pop-up message
23. 23.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.True or false: adding up a bill is an input. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 430; // 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 1 (b) line 2 (c) line 4 (d) line 3
28. 28.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
30. 30.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
31. 31.⚙️ What number does this app show?
    let price = 350; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.True or false: sorting the scores is an output. (a) False (b) True
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (c) line 4 (d) line 3
34. 34.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.Which of these is an input? (a) sorting the scores (b) a buzz (vibration) (c) typing your age (d) working out a tip
36. 36.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
37. 37.Which of these is an output? (a) sorting the scores (b) a pop-up message (c) speaking a command (d) taking a photo
38. 38.⚙️ 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 3 (b) line 1 (c) line 2
39. 39.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
40. 40.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output

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