← Input, processing and output lesson New set →

App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 187 · 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.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  2. 2.True or false: working out a tip is an input. (a) True (b) False
  3. 3.True or false: a beep sound is an output. (a) True (b) False
  4. 4.⚙️ What number does this app show?
    let bill = 80; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  5. 5.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
  6. 6.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
  7. 7.Which of these is an output? (a) sorting the scores (b) working out a tip (c) typing your age (d) a result on screen
  8. 8.🔍 Which is the odd one out? (a) taking a photo (b) a result on screen (c) typing your age (d) tapping a button
  9. 9.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
  10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 50; // 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 1 (b) line 4 (c) line 3 (d) line 2
  11. 11.⚙️ 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);
  12. 12.⚙️ 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 1 (b) line 2 (c) line 3
  13. 13.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
  14. 14.Which of these is processing? (a) typing your age (b) tapping a button (c) taking a photo (d) adding up a bill
  15. 15.⚙️ What number does this app show?
    let bill = 126; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
  16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 240; // 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
  17. 17.Which of these is an input? (a) tapping a button (b) a buzz (vibration) (c) checking a password (d) a beep sound
  18. 18.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a pop-up message (d) taking a photo
  19. 19.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
  20. 20.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
  21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 2 (c) line 4 (d) line 1
  22. 22.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) a pop-up message
  23. 23.⚙️ 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 1 (b) line 2 (c) line 4 (d) line 3
  24. 24.Which of these is an output? (a) adding up a bill (b) a beep sound (c) taking a photo (d) checking a password
  25. 25.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
  26. 26.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  27. 27.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
  28. 28.True or false: a pop-up message is an input. (a) False (b) True
  29. 29.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
  30. 30.⚙️ What number does this app show?
    let bill = 188; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  31. 31.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) tapping a button (d) typing your age
  32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 560; // 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 3 (b) line 4 (c) line 2 (d) line 1
  33. 33.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) adding up a bill (d) speaking a command
  34. 34.Which of these is an input? (a) speaking a command (b) sorting the scores (c) checking a password (d) a result on screen
  35. 35.⚙️ 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);
  36. 36.⚙️ What number does this app show?
    let bill = 164; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (d) line 1
  38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 2 (b) line 3 (c) line 1
  39. 39.True or false: working out a tip is processing. (a) False (b) True
  40. 40.🔍 Which is the odd one out? (a) sorting the scores (b) tapping a button (c) speaking a command (d) taking a photo

Answer key

  1. line 2
  2. False
  3. True
  4. 40
  5. 11000
  6. 15000
  7. a result on screen
  8. a result on screen
  9. input
  10. line 3
  11. 370
  12. line 2
  13. 6000
  14. adding up a bill
  15. 42
  16. line 3
  17. tapping a button
  18. taking a photo
  19. output
  20. 3000
  21. line 3
  22. a pop-up message
  23. line 3
  24. a beep sound
  25. 10000
  26. 120
  27. processing
  28. False
  29. input
  30. 47
  31. a beep sound
  32. line 3
  33. speaking a command
  34. speaking a command
  35. 300
  36. 41
  37. line 3
  38. line 2
  39. True
  40. sorting the scores

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