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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 782 · 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 of these is an output? (a) a buzz (vibration) (b) adding up a bill (c) typing your age (d) tapping a button
  2. 2.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
  3. 3.Which of these is processing? (a) a pop-up message (b) a buzz (vibration) (c) checking a password (d) typing your age
  4. 4.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  5. 5.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  6. 6.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
  7. 7.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  8. 8.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
  9. 9.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 1 (b) line 2 (c) line 3
  10. 10.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
  11. 11.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
  12. 12.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
  13. 13.⚙️ What number does this app show?
    let bill = 34; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  14. 14.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
  15. 15.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) working out a tip (d) checking a password
  16. 16.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
  17. 17.⚙️ What number does this app show?
    let bill = 74; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  18. 18.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
  19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 2 (c) line 1
  20. 20.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) a beep sound
  21. 21.⚙️ What number does this app show?
    let bill = 300; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  22. 22.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
  23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 4 (c) line 3 (d) line 1
  24. 24.⚙️ What number does this app show?
    let bill = 102; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  26. 26.True or false: adding up a bill is an output. (a) True (b) False
  27. 27.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  28. 28.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  29. 29.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
  30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 2 (b) line 1 (c) line 3 (d) line 4
  31. 31.True or false: working out a tip is processing. (a) True (b) False
  32. 32.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
  33. 33.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
  34. 34.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
  35. 35.True or false: typing your age is an output. (a) True (b) False
  36. 36.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  37. 37.Which of these is an input? (a) a beep sound (b) a result on screen (c) a buzz (vibration) (d) typing your age
  38. 38.⚙️ What number does this app show?
    let km = 9; // 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 = 490; // 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 4 (c) line 2 (d) line 3
  40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 350; // 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 2 (b) line 3 (c) line 4 (d) line 1

Answer key

  1. a buzz (vibration)
  2. 7000
  3. checking a password
  4. 470
  5. 90
  6. output
  7. 260
  8. 10000
  9. line 2
  10. 490
  11. processing
  12. 2000
  13. 17
  14. 3000
  15. typing your age
  16. 15000
  17. 37
  18. 4000
  19. line 2
  20. a beep sound
  21. 75
  22. input
  23. line 3
  24. 51
  25. line 2
  26. False
  27. 70
  28. 18
  29. processing
  30. line 3
  31. True
  32. output
  33. output
  34. processing
  35. False
  36. 120
  37. typing your age
  38. 9000
  39. line 3
  40. line 3

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