App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 786 · 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 = 40; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
3. 3.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
4. 4.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a pop-up message (d) working out a tip
5. 5.⚙️ What number does this app show?
   let price = 410; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.Which of these is processing? (a) a pop-up message (b) tapping a button (c) taking a photo (d) working out a tip
7. 7.True or false: a buzz (vibration) is an input. (a) False (b) True
8. 8.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
9. 9.True or false: a beep sound is processing. (a) False (b) True
10. 10.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) a beep sound (d) checking a password
11. 11.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: typing your age is an input. (a) False (b) True
13. 13.Which of these is an input? (a) adding up a bill (b) a beep sound (c) typing your age (d) a buzz (vibration)
14. 14.Which of these is processing? (a) taking a photo (b) a pop-up message (c) a result on screen (d) sorting the scores
15. 15.True or false: a buzz (vibration) is processing. (a) True (b) False
16. 16.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.Which of these is an output? (a) a pop-up message (b) typing your age (c) working out a tip (d) sorting the scores
18. 18.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
19. 19.Which of these is an input? (a) tapping a button (b) checking a password (c) working out a tip (d) a pop-up message
20. 20.True or false: adding up a bill is processing. (a) True (b) False
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // 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 1 (b) line 2 (c) line 3 (d) line 4
22. 22.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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
25. 25.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) taking a photo (d) a beep sound
26. 26.Which of these is processing? (a) a result on screen (b) speaking a command (c) adding up a bill (d) a pop-up message
27. 27.Which of these is an output? (a) working out a tip (b) typing your age (c) a buzz (vibration) (d) taking a photo
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 = 120; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
31. 31.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
32. 32.Which of these is an output? (a) a result on screen (b) sorting the scores (c) working out a tip (d) tapping a button
33. 33.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 46; // typed by the user
    line 2: let friends = 2; // 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
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 590; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
36. 36.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
37. 37.Which of these is an input? (a) taking a photo (b) checking a password (c) working out a tip (d) a result on screen
38. 38.True or false: working out a tip is processing. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) a result on screen
40. 40.True or false: checking a password is an output. (a) False (b) True

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