App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 263 · 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) typing your age (b) sorting the scores (c) a buzz (vibration) (d) adding up a bill
2. 2.⚙️ What number does this app show?
   let price = 75; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
3. 3.True or false: speaking a command is an input. (a) False (b) True
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 240; // 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 4 (b) line 3 (c) line 1 (d) line 2
5. 5.⚙️ What number does this app show?
   let bill = 300; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
7. 7.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) checking a password (d) speaking a command
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 205; // 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 4 (b) line 1 (c) line 2 (d) line 3
9. 9.Which of these is processing? (a) typing your age (b) tapping a button (c) sorting the scores (d) speaking a command
10. 10.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.Which of these is an input? (a) a result on screen (b) a pop-up message (c) checking a password (d) tapping a button
13. 13.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
15. 15.Which of these is an output? (a) speaking a command (b) a pop-up message (c) adding up a bill (d) taking a photo
16. 16.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
17. 17.Which of these is processing? (a) adding up a bill (b) taking a photo (c) a pop-up message (d) a result on screen
18. 18.True or false: a pop-up message is an output. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
20. 20.True or false: sorting the scores is processing. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.True or false: a buzz (vibration) is an output. (a) False (b) True
23. 23.Which of these is an output? (a) a buzz (vibration) (b) taking a photo (c) working out a tip (d) sorting the scores
24. 24.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
25. 25.⚙️ What number does this app show?
    let bill = 215; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
27. 27.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) checking a password
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 3 (b) line 4 (c) line 2 (d) line 1
29. 29.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.Which of these is an input? (a) speaking a command (b) a result on screen (c) working out a tip (d) a beep sound
31. 31.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
33. 33.True or false: tapping a button is an input. (a) False (b) True
34. 34.True or false: typing your age is processing. (a) True (b) False
35. 35.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
36. 36.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.True or false: a pop-up message is processing. (a) True (b) False
38. 38.True or false: a buzz (vibration) is an input. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) adding up a bill (d) tapping a button
40. 40.True or false: taking a photo is an input. (a) True (b) False

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