App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 468 · 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 is the odd one out? (a) sorting the scores (b) a result on screen (c) adding up a bill (d) checking a password
2. 2.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
3. 3.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) typing your age (d) a buzz (vibration)
4. 4.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 25; // 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 2 (b) line 3 (c) line 1 (d) line 4
6. 6.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 200; // 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 4 (c) line 2 (d) line 3
8. 8.🔍 Which is the odd one out? (a) a buzz (vibration) (b) working out a tip (c) a pop-up message (d) a beep sound
9. 9.True or false: speaking a command is an input. (a) False (b) True
10. 10.⚙️ 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);
11. 11.True or false: sorting the scores is an output. (a) True (b) False
12. 12.Which of these is an input? (a) a beep sound (b) adding up a bill (c) a buzz (vibration) (d) taking a photo
13. 13.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) working out a tip (d) sorting the scores
14. 14.⚙️ What number does this app show?
    let price = 330; // 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 = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.Which of these is an input? (a) speaking a command (b) a result on screen (c) a beep sound (d) adding up a bill
17. 17.⚙️ What number does this app show?
    let bill = 395; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
19. 19.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) working out a tip (d) sorting the scores
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
21. 21.⚙️ 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 2 (b) line 3 (c) line 1
22. 22.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.⚙️ 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);
24. 24.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.True or false: tapping a button is processing. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) a pop-up message (b) taking a photo (c) a beep sound (d) a buzz (vibration)
27. 27.True or false: a beep sound is an output. (a) True (b) False
28. 28.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.True or false: working out a tip is processing. (a) False (b) True
30. 30.True or false: working out a tip is an input. (a) True (b) False
31. 31.True or false: adding up a bill is an input. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) a pop-up message (b) speaking a command (c) a beep sound (d) a buzz (vibration)
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 2 (b) line 4 (c) line 3 (d) line 1
34. 34.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
35. 35.Which of these is an output? (a) sorting the scores (b) tapping a button (c) a buzz (vibration) (d) adding up a bill
36. 36.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
37. 37.Which of these is an input? (a) a beep sound (b) checking a password (c) working out a tip (d) tapping a button
38. 38.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) speaking a command (d) typing your age
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 3 (c) line 1 (d) line 2
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 250; // 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 3 (b) line 1 (c) line 4 (d) line 2

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