App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 511 · 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 = 170; // typed by the user
   line 2: let off = 20; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 4 (b) line 1 (c) line 3 (d) line 2
2. 2.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) a buzz (vibration) (d) a beep sound
3. 3.🔍 Which is the odd one out? (a) a result on screen (b) adding up a bill (c) a pop-up message (d) a beep sound
4. 4.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
5. 5.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
6. 6.Which of these is an output? (a) a buzz (vibration) (b) typing your age (c) checking a password (d) taking a photo
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 88; // 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 1 (d) line 2
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 135; // 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 2 (c) line 3 (d) line 4
9. 9.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) a buzz (vibration) (d) a pop-up message
10. 10.True or false: a result on screen is an input. (a) True (b) False
11. 11.Which of these is an input? (a) a pop-up message (b) checking a password (c) typing your age (d) sorting the scores
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 3 (c) line 1 (d) line 2
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 210; // 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 2 (c) line 4 (d) line 3
14. 14.⚙️ What number does this app show?
    let price = 410; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) speaking a command (d) working out a tip
17. 17.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) speaking a command (d) a pop-up message
19. 19.True or false: speaking a command is processing. (a) True (b) False
20. 20.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.True or false: a result on screen is an output. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) speaking a command (d) a buzz (vibration)
23. 23.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) taking a photo (d) typing your age
24. 24.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) checking a password (d) taking a photo
25. 25.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 264; // 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 3 (c) line 4 (d) line 2
28. 28.⚙️ What number does this app show?
    let bill = 98; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.True or false: a beep sound is an output. (a) True (b) False
30. 30.True or false: adding up a bill is an output. (a) True (b) False
31. 31.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
32. 32.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
33. 33.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a pop-up message (d) speaking a command
34. 34.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.True or false: taking a photo is an output. (a) True (b) False
36. 36.True or false: a pop-up message is processing. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let bill = 224; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.Which of these is an input? (a) adding up a bill (b) a result on screen (c) tapping a button (d) sorting the scores
39. 39.Which of these is processing? (a) tapping a button (b) speaking a command (c) working out a tip (d) taking a photo
40. 40.⚙️ What number does this app show?
    let bill = 235; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);

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