← Input, processing and output lesson New set →

App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 390 · 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.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
  2. 2.⚙️ 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 3 (b) line 2 (c) line 1
  3. 3.True or false: a beep sound is processing. (a) False (b) True
  4. 4.⚙️ What number does this app show?
    let bill = 100; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  5. 5.True or false: typing your age is an input. (a) True (b) False
  6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
  7. 7.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
  8. 8.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
  9. 9.⚙️ What number does this app show?
    let bill = 106; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  10. 10.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  11. 11.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
  12. 12.⚙️ 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
  13. 13.Which of these is processing? (a) tapping a button (b) checking a password (c) typing your age (d) a buzz (vibration)
  14. 14.Which of these is processing? (a) a pop-up message (b) typing your age (c) taking a photo (d) adding up a bill
  15. 15.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 1 (b) line 3 (c) line 2
  17. 17.Which of these is an output? (a) checking a password (b) a result on screen (c) sorting the scores (d) speaking a command
  18. 18.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
  19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
  20. 20.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
  21. 21.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
  22. 22.True or false: tapping a button is an output. (a) False (b) True
  23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 102; // 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 1 (c) line 2 (d) line 4
  24. 24.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
  25. 25.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
  26. 26.Which of these is an output? (a) a beep sound (b) taking a photo (c) working out a tip (d) typing your age
  27. 27.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) working out a tip (d) typing your age
  28. 28.True or false: working out a tip is processing. (a) False (b) True
  29. 29.True or false: a result on screen is an input. (a) False (b) True
  30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 270; // 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 2 (c) line 1 (d) line 3
  31. 31.True or false: taking a photo is an output. (a) False (b) True
  32. 32.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) a buzz (vibration)
  33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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
  34. 34.🔍 Which is the odd one out? (a) sorting the scores (b) speaking a command (c) checking a password (d) adding up a bill
  35. 35.⚙️ 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 4 (b) line 3 (c) line 2 (d) line 1
  36. 36.⚙️ What number does this app show?
    let bill = 55; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  37. 37.⚙️ What number does this app show?
    let bill = 76; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  38. 38.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
  39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 1 (c) line 2 (d) line 4
  40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 230; // 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 3 (d) line 4

Answer key

  1. input
  2. line 2
  3. False
  4. 50
  5. True
  6. input
  7. output
  8. processing
  9. 53
  10. 540
  11. 6000
  12. line 2
  13. checking a password
  14. adding up a bill
  15. 570
  16. line 2
  17. a result on screen
  18. 9000
  19. input
  20. input
  21. 4000
  22. False
  23. line 3
  24. output
  25. processing
  26. a beep sound
  27. typing your age
  28. True
  29. False
  30. line 3
  31. False
  32. a buzz (vibration)
  33. line 3
  34. speaking a command
  35. line 3
  36. 11
  37. 19
  38. 15000
  39. line 3
  40. line 3

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