App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 588 · 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.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
2. 2.⚙️ What number does this app show?
   let bill = 160; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
4. 4.Which of these is an input? (a) sorting the scores (b) checking a password (c) adding up a bill (d) taking a photo
5. 5.True or false: a result on screen is processing. (a) True (b) False
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 8; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
7. 7.True or false: a beep sound is processing. (a) False (b) True
8. 8.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 285; // 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 2 (b) line 3 (c) line 1 (d) line 4
10. 10.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 4 (b) line 2 (c) line 1 (d) line 3
13. 13.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.True or false: tapping a button is an input. (a) True (b) False
15. 15.True or false: a result on screen is an output. (a) False (b) True
16. 16.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) sorting the scores (d) taking a photo
17. 17.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 124; // 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 3 (d) line 4
19. 19.True or false: adding up a bill is an input. (a) False (b) True
20. 20.True or false: typing your age is an input. (a) False (b) True
21. 21.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
22. 22.True or false: a result on screen is an input. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) speaking a command (d) a buzz (vibration)
24. 24.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 3 (d) line 1
26. 26.⚙️ 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);
27. 27.True or false: taking a photo is an input. (a) False (b) True
28. 28.True or false: adding up a bill is an output. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.True or false: tapping a button is processing. (a) False (b) True
31. 31.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
33. 33.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) adding up a bill (d) checking a password
34. 34.True or false: a buzz (vibration) is processing. (a) False (b) True
35. 35.True or false: checking a password is processing. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) a beep sound (d) a result on screen
37. 37.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
38. 38.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ What number does this app show?
    let bill = 171; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output

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