← Input, processing and output lesson New set →

App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 330 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.True or false: a beep sound is an output. (a) False (b) True
  2. 2.Which of these is processing? (a) speaking a command (b) a result on screen (c) a buzz (vibration) (d) sorting the scores
  3. 3.True or false: tapping a button is an input. (a) True (b) False
  4. 4.True or false: tapping a button is an output. (a) True (b) False
  5. 5.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
  6. 6.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
  7. 7.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
  8. 8.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 4 (b) line 3 (c) line 2 (d) line 1
  9. 9.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) working out a tip
  10. 10.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
  11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 540; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 3 (b) line 1 (c) line 2 (d) line 4
  12. 12.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) checking a password (d) sorting the scores
  13. 13.⚙️ What number does this app show?
    let bill = 185; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  14. 14.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) typing your age (d) taking a photo
  15. 15.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
  16. 16.Which of these is an input? (a) sorting the scores (b) working out a tip (c) checking a password (d) typing your age
  17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 90; // 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 1 (d) line 2
  18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
  19. 19.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  20. 20.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) speaking a command
  21. 21.True or false: checking a password is an input. (a) False (b) True
  22. 22.⚙️ What number does this app show?
    let bill = 138; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  23. 23.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  24. 24.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) taking a photo (d) a result on screen
  25. 25.True or false: a buzz (vibration) is processing. (a) True (b) False
  26. 26.Which of these is an output? (a) tapping a button (b) a beep sound (c) adding up a bill (d) checking a password
  27. 27.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) working out a tip (d) tapping a button
  28. 28.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
  29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 2 (b) line 1 (c) line 4 (d) line 3
  30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 308; // 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 3 (c) line 1 (d) line 4
  31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 147; // 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 1 (b) line 2 (c) line 4 (d) line 3
  32. 32.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) checking a password (d) speaking a command
  33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 3 (c) line 2 (d) line 1
  34. 34.Which of these is processing? (a) taking a photo (b) a buzz (vibration) (c) adding up a bill (d) typing your age
  35. 35.⚙️ 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);
  36. 36.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
  37. 37.Which of these is an output? (a) a buzz (vibration) (b) speaking a command (c) typing your age (d) taking a photo
  38. 38.⚙️ 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 2 (c) line 4 (d) line 1
  39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 3 (b) line 4 (c) line 2 (d) line 1
  40. 40.⚙️ What number does this app show?
    let bill = 152; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);

Answer key

  1. True
  2. sorting the scores
  3. True
  4. False
  5. input
  6. input
  7. output
  8. line 3
  9. working out a tip
  10. 13000
  11. line 3
  12. a buzz (vibration)
  13. 37
  14. a beep sound
  15. 3000
  16. typing your age
  17. line 3
  18. processing
  19. 24
  20. speaking a command
  21. False
  22. 69
  23. 370
  24. a result on screen
  25. False
  26. a beep sound
  27. tapping a button
  28. output
  29. line 3
  30. line 3
  31. line 3
  32. checking a password
  33. line 3
  34. adding up a bill
  35. 200
  36. 270
  37. a buzz (vibration)
  38. line 3
  39. line 3
  40. 76

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