← Input, processing and output lesson New set →

App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 361 · 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 price = 65; // 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 2 (b) line 1 (c) line 3 (d) line 4
  2. 2.True or false: working out a tip is processing. (a) False (b) True
  3. 3.⚙️ What number does this app show?
    let bill = 32; // typed by the user
    let friends = 2; // 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.True or false: a buzz (vibration) is an output. (a) True (b) False
  6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
  7. 7.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
  8. 8.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) a beep sound
  9. 9.True or false: adding up a bill is an output. (a) True (b) False
  10. 10.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
  11. 11.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) checking a password (d) working out a tip
  12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 48; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 2 (b) line 4 (c) line 1 (d) line 3
  13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 201; // 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 1 (b) line 3 (c) line 2 (d) line 4
  14. 14.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
  15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  16. 16.⚙️ 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 2 (b) line 4 (c) line 1 (d) line 3
  17. 17.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a result on screen (d) typing your age
  18. 18.True or false: adding up a bill is processing. (a) False (b) True
  19. 19.⚙️ What number does this app show?
    let bill = 44; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  20. 20.True or false: a beep sound is an input. (a) True (b) False
  21. 21.True or false: typing your age is an output. (a) False (b) True
  22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 340; // 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 4 (b) line 2 (c) line 1 (d) line 3
  23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 150; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 3 (b) line 4 (c) line 1 (d) line 2
  24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 256; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 2 (b) line 1 (c) line 4 (d) line 3
  25. 25.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  26. 26.True or false: speaking a command is an input. (a) False (b) True
  27. 27.Which of these is an output? (a) adding up a bill (b) working out a tip (c) taking a photo (d) a pop-up message
  28. 28.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
  29. 29.Which of these is an input? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) typing your age
  30. 30.Which of these is an output? (a) typing your age (b) a buzz (vibration) (c) working out a tip (d) speaking a command
  31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 225; // 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 3 (c) line 2 (d) line 4
  32. 32.True or false: checking a password is an output. (a) False (b) True
  33. 33.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) adding up a bill (d) working out a tip
  34. 34.True or false: typing your age is an input. (a) True (b) False
  35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 128; // typed by the user
    line 2: let friends = 4; // 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
  36. 36.⚙️ What number does this app show?
    let bill = 124; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  37. 37.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
  38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 46; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 3 (b) line 4 (c) line 2 (d) line 1
  39. 39.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
  40. 40.True or false: a result on screen is an output. (a) False (b) True

Answer key

  1. line 3
  2. True
  3. 16
  4. output
  5. True
  6. input
  7. output
  8. a beep sound
  9. False
  10. 130
  11. taking a photo
  12. line 3
  13. line 3
  14. processing
  15. line 2
  16. line 3
  17. a result on screen
  18. True
  19. 22
  20. False
  21. False
  22. line 3
  23. line 3
  24. line 3
  25. 530
  26. True
  27. a pop-up message
  28. 4000
  29. typing your age
  30. a buzz (vibration)
  31. line 3
  32. False
  33. speaking a command
  34. True
  35. line 3
  36. 31
  37. output
  38. line 3
  39. 300
  40. True

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