App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 175 · 40 questions

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.

1. 1.True or false: sorting the scores is an input. (a) True (b) False
2. 2.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
3. 3.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
4. 4.True or false: adding up a bill is processing. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 198; // 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 2 (b) line 4 (c) line 1 (d) line 3
6. 6.True or false: speaking a command is processing. (a) True (b) False
7. 7.Which of these is an output? (a) a result on screen (b) working out a tip (c) sorting the scores (d) taking a photo
8. 8.⚙️ What number does this app show?
   let price = 320; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.True or false: checking a password is processing. (a) False (b) True
11. 11.True or false: working out a tip is processing. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) a result on screen
13. 13.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.True or false: checking a password is an output. (a) True (b) False
15. 15.Which of these is processing? (a) speaking a command (b) adding up a bill (c) a pop-up message (d) typing your age
16. 16.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) a buzz (vibration) (d) a beep sound
17. 17.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) checking a password (d) adding up a bill
18. 18.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) adding up a bill (d) a pop-up message
21. 21.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
22. 22.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
23. 23.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) adding up a bill (d) working out a tip
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 144; // 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 2 (b) line 1 (c) line 4 (d) line 3
25. 25.⚙️ What number does this app show?
    let bill = 60; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.Which of these is an input? (a) a result on screen (b) working out a tip (c) sorting the scores (d) tapping a button
27. 27.True or false: typing your age is an input. (a) True (b) False
28. 28.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
29. 29.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) tapping a button
30. 30.Which of these is an output? (a) sorting the scores (b) working out a tip (c) typing your age (d) a pop-up message
31. 31.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a result on screen (d) checking a password
32. 32.⚙️ What number does this app show?
    let bill = 252; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
34. 34.Which of these is processing? (a) taking a photo (b) a result on screen (c) a pop-up message (d) working out a tip
35. 35.Which of these is an output? (a) checking a password (b) adding up a bill (c) speaking a command (d) a beep sound
36. 36.⚙️ 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 3 (b) line 4 (c) line 2 (d) line 1
37. 37.Which of these is an input? (a) a beep sound (b) a buzz (vibration) (c) taking a photo (d) working out a tip
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 220; // 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 1 (b) line 2 (c) line 4 (d) line 3
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 1 (d) line 3
40. 40.⚙️ What number does this app show?
    let bill = 136; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);

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