← Input, processing and output lesson New set →

App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 387 · 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: taking a photo is an input. (a) True (b) False
  2. 2.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a result on screen (d) sorting the scores
  3. 3.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 1 (c) line 3 (d) line 2
  4. 4.⚙️ What number does this app show?
    let bill = 148; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  5. 5.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
  6. 6.True or false: tapping a button is an output. (a) True (b) False
  7. 7.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 4 (b) line 3 (c) line 1 (d) line 2
  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 1 (b) line 2 (c) line 4 (d) line 3
  9. 9.⚙️ What number does this app show?
    let bill = 395; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  10. 10.⚙️ What number does this app show?
    let bill = 155; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
  12. 12.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
  13. 13.Which of these is processing? (a) a buzz (vibration) (b) speaking a command (c) a beep sound (d) working out a tip
  14. 14.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  15. 15.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  16. 16.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
  17. 17.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) checking a password (d) typing your age
  18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 1 (b) line 3 (c) line 4 (d) line 2
  19. 19.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) sorting the scores (d) checking a password
  20. 20.Which of these is processing? (a) typing your age (b) adding up a bill (c) taking a photo (d) a result on screen
  21. 21.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
  22. 22.⚙️ 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);
  23. 23.⚙️ 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 2 (b) line 3 (c) line 1
  24. 24.⚙️ What number does this app show?
    let bill = 180; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
  25. 25.Which of these is processing? (a) a beep sound (b) sorting the scores (c) taking a photo (d) typing your age
  26. 26.True or false: checking a password is processing. (a) False (b) True
  27. 27.Which of these is an input? (a) taking a photo (b) a result on screen (c) sorting the scores (d) a beep sound
  28. 28.🔍 Which is the odd one out? (a) sorting the scores (b) a beep sound (c) working out a tip (d) checking a password
  29. 29.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) a beep sound (d) a buzz (vibration)
  30. 30.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 330; // 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 3 (b) line 2 (c) line 1 (d) line 4
  32. 32.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
  33. 33.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  34. 34.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
  35. 35.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
  36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 2 (d) line 3
  37. 37.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
  38. 38.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) typing your age (d) taking a photo
  39. 39.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  40. 40.True or false: tapping a button is an input. (a) True (b) False

Answer key

  1. True
  2. a result on screen
  3. line 3
  4. 37
  5. 150
  6. False
  7. line 3
  8. line 3
  9. 79
  10. 31
  11. input
  12. 5000
  13. working out a tip
  14. 350
  15. 190
  16. output
  17. checking a password
  18. line 3
  19. speaking a command
  20. adding up a bill
  21. output
  22. 260
  23. line 2
  24. 60
  25. sorting the scores
  26. True
  27. taking a photo
  28. a beep sound
  29. tapping a button
  30. 30
  31. line 3
  32. processing
  33. 300
  34. input
  35. 425
  36. line 3
  37. input
  38. adding up a bill
  39. 60
  40. True

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