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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 471 · 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 = 180; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
  2. 2.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  3. 3.True or false: a beep sound is an output. (a) False (b) True
  4. 4.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) working out a tip (d) adding up a bill
  5. 5.⚙️ 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 1 (b) line 3 (c) line 2 (d) line 4
  6. 6.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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
  7. 7.True or false: speaking a command is an input. (a) True (b) False
  8. 8.🔍 Which is the odd one out? (a) a buzz (vibration) (b) working out a tip (c) a beep sound (d) a pop-up message
  9. 9.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) sorting the scores (d) a beep sound
  10. 10.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
  11. 11.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
  12. 12.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  13. 13.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  14. 14.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  15. 15.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) a beep sound (d) speaking a command
  16. 16.Which of these is processing? (a) sorting the scores (b) taking a photo (c) typing your age (d) tapping a button
  17. 17.🔍 Which is the odd one out? (a) a beep sound (b) speaking a command (c) a result on screen (d) a pop-up message
  18. 18.Which of these is an input? (a) sorting the scores (b) a buzz (vibration) (c) checking a password (d) taking a photo
  19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
  20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 1 (b) line 4 (c) line 3 (d) line 2
  21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // 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 2 (b) line 4 (c) line 1 (d) line 3
  22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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
  23. 23.Which of these is an output? (a) a beep sound (b) speaking a command (c) taking a photo (d) tapping a button
  24. 24.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
  25. 25.Which of these is an output? (a) adding up a bill (b) a result on screen (c) speaking a command (d) sorting the scores
  26. 26.Which of these is an input? (a) adding up a bill (b) typing your age (c) sorting the scores (d) a pop-up message
  27. 27.⚙️ 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);
  28. 28.True or false: sorting the scores is processing. (a) False (b) True
  29. 29.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
  30. 30.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) sorting the scores (d) typing your age
  31. 31.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
  32. 32.⚙️ 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 2 (c) line 3 (d) line 1
  33. 33.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
  34. 34.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  35. 35.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 4 (c) line 2 (d) line 3
  37. 37.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
  38. 38.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
  39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (b) line 3 (c) line 2 (d) line 1
  40. 40.⚙️ 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 1 (b) line 3 (c) line 2

Answer key

  1. 130
  2. 370
  3. True
  4. a result on screen
  5. line 3
  6. line 3
  7. True
  8. working out a tip
  9. sorting the scores
  10. input
  11. output
  12. 135
  13. 24
  14. 140
  15. a beep sound
  16. sorting the scores
  17. speaking a command
  18. taking a photo
  19. input
  20. line 3
  21. line 3
  22. line 3
  23. a beep sound
  24. output
  25. a result on screen
  26. typing your age
  27. 120
  28. True
  29. input
  30. typing your age
  31. 12000
  32. line 3
  33. processing
  34. 510
  35. 520
  36. line 3
  37. 330
  38. input
  39. line 3
  40. line 2

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