App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 224 · 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) sorting the scores (b) adding up a bill (c) speaking a command (d) checking a password
2. 2.Which of these is an input? (a) a buzz (vibration) (b) a pop-up message (c) a beep sound (d) taking a photo
3. 3.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
4. 4.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.Which of these is processing? (a) a beep sound (b) a result on screen (c) adding up a bill (d) speaking a command
6. 6.True or false: taking a photo is an input. (a) False (b) True
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 1 (c) line 3 (d) line 2
8. 8.🔍 Which is the odd one out? (a) sorting the scores (b) a buzz (vibration) (c) a result on screen (d) a beep sound
9. 9.Which of these is processing? (a) tapping a button (b) a result on screen (c) speaking a command (d) checking a password
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
11. 11.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
12. 12.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
13. 13.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 235; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 1 (c) line 4 (d) line 3
15. 15.True or false: adding up a bill is an output. (a) True (b) False
16. 16.Which of these is an input? (a) a beep sound (b) a result on screen (c) speaking a command (d) adding up a bill
17. 17.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
19. 19.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
21. 21.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
22. 22.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) a beep sound
23. 23.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) working out a tip (d) a buzz (vibration)
24. 24.Which of these is an output? (a) tapping a button (b) checking a password (c) a pop-up message (d) taking a photo
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 2 (b) line 3 (c) line 1 (d) line 4
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // typed by the user
    line 2: let off = 20; // 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
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 164; // 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 2 (b) line 1 (c) line 3 (d) line 4
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 2 (c) line 1 (d) line 3
29. 29.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.Which of these is processing? (a) tapping a button (b) working out a tip (c) a buzz (vibration) (d) taking a photo
31. 31.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
32. 32.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
33. 33.Which of these is an output? (a) working out a tip (b) a result on screen (c) taking a photo (d) checking a password
34. 34.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) sorting the scores (d) a result on screen
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
36. 36.⚙️ What number does this app show?
    let bill = 132; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.Which of these is an output? (a) working out a tip (b) sorting the scores (c) a buzz (vibration) (d) adding up a bill
38. 38.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) taking a photo (d) a buzz (vibration)
39. 39.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
40. 40.⚙️ 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

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