App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 173 · 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 = 70; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 28; // 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 3 (d) line 4
3. 3.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 190; // 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 3 (b) line 2 (c) line 4 (d) line 1
5. 5.True or false: typing your age is an input. (a) True (b) False
6. 6.True or false: tapping a button is processing. (a) True (b) False
7. 7.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
8. 8.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) speaking a command (d) a buzz (vibration)
9. 9.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 45; // 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 4 (b) line 3 (c) line 2 (d) line 1
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 4 (b) line 3 (c) line 1 (d) line 2
12. 12.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.🔍 Which is the odd one out? (a) tapping a button (b) a pop-up message (c) speaking a command (d) typing your age
15. 15.🔍 Which is the odd one out? (a) sorting the scores (b) a result on screen (c) adding up a bill (d) working out a tip
16. 16.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
17. 17.Which of these is processing? (a) taking a photo (b) a buzz (vibration) (c) typing your age (d) working out a tip
18. 18.True or false: a result on screen is processing. (a) True (b) False
19. 19.True or false: adding up a bill is an input. (a) False (b) True
20. 20.Which of these is an output? (a) checking a password (b) a beep sound (c) sorting the scores (d) working out a tip
21. 21.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) sorting the scores (d) a beep sound
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 530; // 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 4 (b) line 3 (c) line 2 (d) line 1
23. 23.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
25. 25.True or false: speaking a command is an input. (a) False (b) True
26. 26.⚙️ 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 3 (b) line 1 (c) line 2
27. 27.Which of these is an output? (a) tapping a button (b) sorting the scores (c) typing your age (d) a buzz (vibration)
28. 28.Which of these is an output? (a) tapping a button (b) working out a tip (c) a result on screen (d) speaking a command
29. 29.True or false: a pop-up message is an input. (a) False (b) True
30. 30.Which of these is an input? (a) tapping a button (b) a pop-up message (c) checking a password (d) adding up a bill
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
32. 32.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) checking a password (d) taking a photo
33. 33.⚙️ 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);
34. 34.True or false: tapping a button is an input. (a) False (b) True
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // 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 4 (b) line 3 (c) line 2 (d) line 1
36. 36.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a result on screen (d) working out a tip
37. 37.True or false: a beep sound is an input. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let bill = 237; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 292; // 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 4 (b) line 1 (c) line 2 (d) line 3
40. 40.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);

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