App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 132 · 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 60; // 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 2 (c) line 4 (d) line 3
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 224; // 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 2 (c) line 3 (d) line 1
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 30; // 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 2 (d) line 3
4. 4.⚙️ What number does this app show?
   let bill = 108; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) working out a tip (d) a pop-up message
6. 6.⚙️ What number does this app show?
   let km = 7; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.True or false: sorting the scores is processing. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) adding up a bill (d) speaking a command
9. 9.Which of these is an output? (a) a result on screen (b) tapping a button (c) working out a tip (d) typing your age
10. 10.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
12. 12.🔍 Which is the odd one out? (a) sorting the scores (b) a buzz (vibration) (c) adding up a bill (d) working out a tip
13. 13.True or false: a result on screen is processing. (a) False (b) True
14. 14.Which of these is an input? (a) working out a tip (b) sorting the scores (c) adding up a bill (d) speaking a command
15. 15.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 129; // 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 1 (c) line 4 (d) line 3
17. 17.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) checking a password (d) speaking a command
18. 18.True or false: a buzz (vibration) is an output. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) working out a tip (d) a pop-up message
20. 20.True or false: tapping a button is processing. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) checking a password (d) sorting the scores
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 34; // 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
23. 23.True or false: typing your age is processing. (a) True (b) False
24. 24.Which of these is an input? (a) adding up a bill (b) typing your age (c) a result on screen (d) a pop-up message
25. 25.Which of these is an input? (a) a beep sound (b) tapping a button (c) sorting the scores (d) working out a tip
26. 26.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
27. 27.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 3 (c) line 4 (d) line 2
29. 29.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
30. 30.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.True or false: sorting the scores is an output. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) adding up a bill (d) taking a photo
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 3 (c) line 1 (d) line 4
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 76; // 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 4 (c) line 3 (d) line 1
35. 35.⚙️ What number does this app show?
    let price = 40; // 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 price = 50; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
37. 37.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) sorting the scores (d) taking a photo
38. 38.⚙️ What number does this app show?
    let bill = 75; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.True or false: typing your age is an input. (a) True (b) False
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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

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