App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 130 · 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 an input? (a) a result on screen (b) working out a tip (c) adding up a bill (d) speaking a command
2. 2.⚙️ 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 1 (b) line 3 (c) line 2
3. 3.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
4. 4.True or false: a pop-up message is processing. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 5; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
6. 6.Which of these is an input? (a) sorting the scores (b) typing your age (c) adding up a bill (d) checking a password
7. 7.Which of these is an input? (a) checking a password (b) taking a photo (c) a buzz (vibration) (d) working out a tip
8. 8.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
9. 9.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) tapping a button (d) speaking a command
10. 10.True or false: sorting the scores is processing. (a) False (b) True
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 3 (b) line 2 (c) line 4 (d) line 1
12. 12.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ What number does this app show?
    let price = 270; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.Which of these is an input? (a) tapping a button (b) adding up a bill (c) sorting the scores (d) a beep sound
15. 15.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
17. 17.True or false: a pop-up message is an output. (a) False (b) True
18. 18.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
19. 19.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.True or false: adding up a bill is an output. (a) True (b) False
21. 21.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // typed by the user
    line 2: let off = 40; // 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
23. 23.True or false: taking a photo is processing. (a) True (b) False
24. 24.⚙️ 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 3 (c) line 1
25. 25.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) checking a password (d) taking a photo
26. 26.True or false: taking a photo is an input. (a) True (b) False
27. 27.Which of these is processing? (a) typing your age (b) a pop-up message (c) speaking a command (d) adding up a bill
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
29. 29.Which of these is an output? (a) working out a tip (b) speaking a command (c) a pop-up message (d) sorting the scores
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 4 (b) line 2 (c) line 3 (d) line 1
31. 31.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
32. 32.⚙️ What number does this app show?
    let bill = 50; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) taking a photo (d) speaking a command
34. 34.Which of these is an output? (a) a result on screen (b) working out a tip (c) typing your age (d) speaking a command
35. 35.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) a beep sound (d) sorting the scores
36. 36.⚙️ 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 1 (b) line 3 (c) line 2
37. 37.Which of these is processing? (a) typing your age (b) a beep sound (c) a result on screen (d) checking a password
38. 38.True or false: typing your age is processing. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 292; // 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 3 (c) line 1 (d) line 4
40. 40.⚙️ What number does this app show?
    let bill = 36; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);

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