App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 783 · 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 of these is processing? (a) sorting the scores (b) a result on screen (c) taking a photo (d) typing your age
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 284; // 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 2 (d) line 1
3. 3.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.Which of these is an input? (a) sorting the scores (b) adding up a bill (c) a buzz (vibration) (d) tapping a button
5. 5.Which of these is an input? (a) checking a password (b) a pop-up message (c) taking a photo (d) a result on screen
6. 6.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) a buzz (vibration) (d) adding up a bill
7. 7.⚙️ 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
8. 8.Which of these is an input? (a) sorting the scores (b) a buzz (vibration) (c) a beep sound (d) typing your age
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 280; // 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 4 (c) line 2 (d) line 3
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 144; // 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 3 (b) line 1 (c) line 2 (d) line 4
11. 11.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 136; // 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 4 (b) line 1 (c) line 3 (d) line 2
13. 13.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
14. 14.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
15. 15.Which of these is processing? (a) tapping a button (b) a pop-up message (c) speaking a command (d) adding up a bill
16. 16.True or false: a buzz (vibration) is an output. (a) False (b) True
17. 17.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
18. 18.True or false: a result on screen is an input. (a) False (b) True
19. 19.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
20. 20.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) a result on screen (d) speaking a command
21. 21.Which of these is processing? (a) a result on screen (b) typing your age (c) a beep sound (d) working out a tip
22. 22.🔍 Which is the odd one out? (a) typing your age (b) a pop-up message (c) a beep sound (d) a result on screen
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 1 (c) line 2 (d) line 3
24. 24.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
25. 25.True or false: tapping a button is processing. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
27. 27.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 1 (b) line 4 (c) line 2 (d) line 3
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 3 (c) line 4 (d) line 1
30. 30.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) checking a password
31. 31.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) taking a photo (d) checking a password
32. 32.True or false: adding up a bill is an output. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) tapping a button (d) speaking a command
34. 34.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
35. 35.True or false: adding up a bill is processing. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) sorting the scores (b) a result on screen (c) working out a tip (d) adding up a bill
37. 37.Which of these is an output? (a) adding up a bill (b) a buzz (vibration) (c) working out a tip (d) typing your age
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 1 (c) line 3 (d) line 4
40. 40.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) tapping a button (d) taking a photo

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