App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 113 · 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 output? (a) taking a photo (b) a buzz (vibration) (c) speaking a command (d) adding up a bill
2. 2.🔍 Which is the odd one out? (a) a buzz (vibration) (b) working out a tip (c) sorting the scores (d) adding up a bill
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 260; // 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 4 (b) line 3 (c) line 2 (d) line 1
4. 4.True or false: a beep sound is an input. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) typing your age (d) speaking a command
6. 6.True or false: speaking a command is processing. (a) True (b) False
7. 7.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
8. 8.True or false: a beep sound is an output. (a) True (b) False
9. 9.⚙️ What number does this app show?
   let km = 11; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.True or false: a result on screen is an output. (a) False (b) True
12. 12.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
13. 13.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 4 (c) line 3 (d) line 2
15. 15.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
17. 17.Which of these is processing? (a) a beep sound (b) checking a password (c) a buzz (vibration) (d) typing your age
18. 18.⚙️ What number does this app show?
    let bill = 198; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
21. 21.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) speaking a command (d) tapping a button
22. 22.⚙️ 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);
23. 23.Which of these is processing? (a) a buzz (vibration) (b) tapping a button (c) working out a tip (d) typing your age
24. 24.Which of these is processing? (a) a buzz (vibration) (b) adding up a bill (c) taking a photo (d) tapping a button
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
26. 26.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
28. 28.Which of these is an input? (a) checking a password (b) tapping a button (c) adding up a bill (d) working out a tip
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // 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 3 (b) line 2 (c) line 4 (d) line 1
30. 30.True or false: a pop-up message is an output. (a) True (b) False
31. 31.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 1 (b) line 4 (c) line 3 (d) line 2
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 1 (c) line 4 (d) line 2
35. 35.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) a beep sound (d) speaking a command
36. 36.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 3 (c) line 4 (d) line 1
39. 39.True or false: checking a password is processing. (a) False (b) True
40. 40.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);

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