App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 698 · 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.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
2. 2.Which of these is an input? (a) a result on screen (b) a pop-up message (c) working out a tip (d) taking a photo
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 200; // 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 3 (c) line 4 (d) line 2
4. 4.True or false: working out a tip is processing. (a) True (b) False
5. 5.⚙️ What number does this app show?
   let bill = 56; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.True or false: working out a tip is an input. (a) True (b) False
7. 7.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
9. 9.⚙️ What number does this app show?
   let bill = 48; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ What number does this app show?
    let bill = 62; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.True or false: typing your age is processing. (a) True (b) False
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 250; // 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 1 (b) line 2 (c) line 4 (d) line 3
13. 13.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
14. 14.⚙️ What number does this app show?
    let bill = 264; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.Which of these is processing? (a) adding up a bill (b) a pop-up message (c) a buzz (vibration) (d) a result on screen
16. 16.True or false: taking a photo is an input. (a) False (b) True
17. 17.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.Which of these is an input? (a) speaking a command (b) sorting the scores (c) a beep sound (d) a pop-up message
19. 19.⚙️ What number does this app show?
    let price = 420; // 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 processing. (a) False (b) True
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 1 (c) line 3 (d) line 2
22. 22.True or false: typing your age is an output. (a) False (b) True
23. 23.⚙️ 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 1 (c) line 3
24. 24.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
25. 25.Which of these is processing? (a) checking a password (b) a beep sound (c) a pop-up message (d) typing your age
26. 26.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
27. 27.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
28. 28.True or false: speaking a command is an output. (a) True (b) False
29. 29.⚙️ What number does this app show?
    let bill = 20; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.Which of these is an output? (a) taking a photo (b) sorting the scores (c) checking a password (d) a result on screen
31. 31.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) checking a password (d) taking a photo
32. 32.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) sorting the scores (d) checking a password
33. 33.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) working out a tip (d) sorting the scores
34. 34.True or false: tapping a button is an output. (a) True (b) False
35. 35.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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
37. 37.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) typing your age (d) sorting the scores
38. 38.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
39. 39.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
40. 40.⚙️ 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);

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