App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 410 · 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.True or false: tapping a button is processing. (a) False (b) True
2. 2.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
3. 3.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) working out a tip (d) checking a password
4. 4.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
5. 5.True or false: sorting the scores is an output. (a) True (b) False
6. 6.Which of these is processing? (a) a beep sound (b) a pop-up message (c) a result on screen (d) working out a tip
7. 7.True or false: typing your age is an input. (a) True (b) False
8. 8.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.⚙️ What number does this app show?
   let bill = 92; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.True or false: a pop-up message is processing. (a) False (b) True
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 bill = 42; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) sorting the scores (d) working out a tip
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
16. 16.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
17. 17.Which of these is processing? (a) a result on screen (b) taking a photo (c) typing your age (d) sorting the scores
18. 18.⚙️ 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 2 (b) line 3 (c) line 1
19. 19.Which of these is processing? (a) typing your age (b) adding up a bill (c) a pop-up message (d) tapping a button
20. 20.⚙️ What number does this app show?
    let bill = 255; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ 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);
23. 23.True or false: checking a password is processing. (a) True (b) False
24. 24.Which of these is an output? (a) taking a photo (b) tapping a button (c) a result on screen (d) checking a password
25. 25.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) working out a tip (d) a beep sound
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 42; // 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
27. 27.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) adding up a bill (d) a beep sound
29. 29.True or false: taking a photo is an output. (a) True (b) False
30. 30.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
31. 31.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
32. 32.⚙️ What number does this app show?
    let bill = 69; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
34. 34.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) a pop-up message
35. 35.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) speaking a command (d) tapping a button
36. 36.Which of these is an output? (a) adding up a bill (b) typing your age (c) speaking a command (d) a beep sound
37. 37.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 115; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 2 (c) line 4 (d) line 1
39. 39.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
40. 40.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) tapping a button (d) sorting the scores

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