App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 623 · 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: a beep sound is processing. (a) True (b) False
2. 2.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
3. 3.⚙️ What number does this app show?
   let bill = 330; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.🔍 Which is the odd one out? (a) a buzz (vibration) (b) typing your age (c) a pop-up message (d) a beep sound
5. 5.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
6. 6.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 430; // 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 2 (b) line 3 (c) line 4 (d) line 1
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 30; // 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 3 (b) line 4 (c) line 1 (d) line 2
9. 9.Which of these is an output? (a) a buzz (vibration) (b) working out a tip (c) sorting the scores (d) taking a photo
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 400; // 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 4 (c) line 1 (d) line 3
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 1 (b) line 2 (c) line 3 (d) line 4
12. 12.Which of these is processing? (a) a buzz (vibration) (b) taking a photo (c) tapping a button (d) working out a tip
13. 13.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) taking a photo (d) adding up a bill
15. 15.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) working out a tip (d) typing your age
16. 16.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
18. 18.Which of these is an output? (a) taking a photo (b) adding up a bill (c) working out a tip (d) a result on screen
19. 19.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) a beep sound (d) a result on screen
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 2 (b) line 3 (c) line 1 (d) line 4
21. 21.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
22. 22.Which of these is processing? (a) tapping a button (b) checking a password (c) speaking a command (d) a beep sound
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 305; // 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 4 (b) line 1 (c) line 3 (d) line 2
24. 24.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
25. 25.⚙️ What number does this app show?
    let bill = 20; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.🔍 Which is the odd one out? (a) a result on screen (b) adding up a bill (c) a buzz (vibration) (d) a beep sound
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // 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 1 (c) line 4 (d) line 3
28. 28.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 68; // typed by the user
    line 2: let friends = 2; // 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
30. 30.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) speaking a command
31. 31.True or false: a beep sound is an input. (a) False (b) True
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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 4 (b) line 2 (c) line 1 (d) line 3
33. 33.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
35. 35.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.True or false: a pop-up message is an output. (a) True (b) False
37. 37.Which of these is an input? (a) checking a password (b) a result on screen (c) taking a photo (d) a buzz (vibration)
38. 38.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
39. 39.⚙️ 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 4 (b) line 3 (c) line 2 (d) line 1
40. 40.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);

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