App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 147 · 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.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 11; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
3. 3.🔍 Which is the odd one out? (a) a result on screen (b) working out a tip (c) a pop-up message (d) a beep sound
4. 4.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) working out a tip (d) a beep sound
5. 5.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) tapping a button (d) adding up a bill
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 280; // 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 1 (b) line 4 (c) line 2 (d) line 3
7. 7.Which of these is an input? (a) taking a photo (b) working out a tip (c) a result on screen (d) a buzz (vibration)
8. 8.⚙️ What number does this app show?
   let bill = 117; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) working out a tip (d) checking a password
10. 10.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
11. 11.Which of these is an output? (a) typing your age (b) working out a tip (c) a beep sound (d) tapping a button
12. 12.Which of these is an output? (a) sorting the scores (b) taking a photo (c) speaking a command (d) a result on screen
13. 13.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) working out a tip (d) tapping a button
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 57; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 1 (c) line 3 (d) line 4
16. 16.Which of these is an output? (a) working out a tip (b) taking a photo (c) a pop-up message (d) typing your age
17. 17.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
18. 18.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
19. 19.Which of these is an input? (a) adding up a bill (b) a buzz (vibration) (c) a beep sound (d) typing your age
20. 20.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 40; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 1 (c) line 4 (d) line 3
22. 22.⚙️ What number does this app show?
    let bill = 87; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.True or false: adding up a bill is an output. (a) False (b) True
24. 24.True or false: working out a tip is an output. (a) True (b) False
25. 25.⚙️ 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);
26. 26.True or false: tapping a button is processing. (a) False (b) True
27. 27.True or false: taking a photo is an output. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) typing your age (d) taking a photo
29. 29.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) taking a photo (d) speaking a command
30. 30.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 159; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 4 (c) line 3 (d) line 2
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // 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 2 (b) line 4 (c) line 1 (d) line 3
33. 33.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) a result on screen (d) typing your age
34. 34.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) taking a photo (d) a beep sound
35. 35.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
36. 36.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.⚙️ What number does this app show?
    let bill = 210; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 460; // 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 1 (c) line 2 (d) line 4
39. 39.True or false: a buzz (vibration) is an input. (a) True (b) False
40. 40.True or false: taking a photo is an input. (a) False (b) True

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