← Input, processing and output lesson New set →

App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 677 · 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.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
  2. 2.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 390; // 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 1 (b) line 2 (c) line 3 (d) line 4
  3. 3.⚙️ What number does this app show?
    let bill = 168; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  4. 4.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
  5. 5.⚙️ What number does this app show?
    let bill = 140; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  6. 6.⚙️ 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 2 (c) line 3
  7. 7.⚙️ What number does this app show?
    let bill = 154; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  8. 8.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 2 (b) line 3 (c) line 1
  9. 9.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) speaking a command (d) sorting the scores
  10. 10.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
  11. 11.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
  12. 12.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
  13. 13.Which of these is processing? (a) a pop-up message (b) a beep sound (c) checking a password (d) a buzz (vibration)
  14. 14.True or false: taking a photo is processing. (a) False (b) True
  15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 3 (c) line 4 (d) line 2
  16. 16.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
  17. 17.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
  18. 18.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
  19. 19.⚙️ What number does this app show?
    let price = 270; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
  20. 20.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
  21. 21.⚙️ What number does this app show?
    let price = 280; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 4 (b) line 1 (c) line 3 (d) line 2
  23. 23.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) taking a photo (d) tapping a button
  24. 24.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
  25. 25.True or false: checking a password is an input. (a) True (b) False
  26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 4 (c) line 2 (d) line 3
  27. 27.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
  28. 28.Which of these is an output? (a) speaking a command (b) a result on screen (c) taking a photo (d) checking a password
  29. 29.⚙️ 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 3 (b) line 2 (c) line 1
  30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 183; // 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 1 (c) line 4 (d) line 2
  31. 31.⚙️ What number does this app show?
    let bill = 28; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  32. 32.True or false: sorting the scores is an input. (a) True (b) False
  33. 33.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
  34. 34.True or false: a beep sound is an output. (a) False (b) True
  35. 35.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
  36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 78; // 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 4 (b) line 3 (c) line 1 (d) line 2
  37. 37.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
  38. 38.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a result on screen (d) tapping a button
  39. 39.Which of these is an input? (a) speaking a command (b) a result on screen (c) a beep sound (d) working out a tip
  40. 40.True or false: a buzz (vibration) is an input. (a) False (b) True

Answer key

  1. 350
  2. line 3
  3. 42
  4. output
  5. 35
  6. line 2
  7. 77
  8. line 2
  9. sorting the scores
  10. output
  11. input
  12. input
  13. checking a password
  14. False
  15. line 3
  16. input
  17. 7000
  18. 15000
  19. 220
  20. 410
  21. 260
  22. line 3
  23. adding up a bill
  24. input
  25. False
  26. line 3
  27. processing
  28. a result on screen
  29. line 2
  30. line 3
  31. 14
  32. False
  33. 140
  34. True
  35. 10000
  36. line 3
  37. 4000
  38. tapping a button
  39. speaking a command
  40. False

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