App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 323 · 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 an input. (a) True (b) False
2. 2.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
3. 3.Which of these is an input? (a) a result on screen (b) adding up a bill (c) tapping a button (d) working out a tip
4. 4.⚙️ What number does this app show?
   let price = 330; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
7. 7.Which of these is an input? (a) a beep sound (b) a buzz (vibration) (c) a pop-up message (d) taking a photo
8. 8.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
9. 9.True or false: a beep sound is processing. (a) True (b) False
10. 10.True or false: sorting the scores is an output. (a) True (b) False
11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
12. 12.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.Which of these is an output? (a) adding up a bill (b) a pop-up message (c) typing your age (d) working out a tip
14. 14.⚙️ What number does this app show?
    let bill = 200; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
16. 16.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
17. 17.Which of these is an output? (a) speaking a command (b) checking a password (c) sorting the scores (d) a result on screen
18. 18.⚙️ What number does this app show?
    let bill = 295; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ 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);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 3 (c) line 4 (d) line 1
21. 21.Which of these is an output? (a) taking a photo (b) tapping a button (c) a buzz (vibration) (d) adding up a bill
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // 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 1 (c) line 3 (d) line 4
23. 23.True or false: speaking a command is an input. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) a result on screen
25. 25.True or false: working out a tip is an input. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) typing your age (d) taking a photo
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 2 (b) line 4 (c) line 3 (d) line 1
28. 28.Which of these is processing? (a) adding up a bill (b) taking a photo (c) a beep sound (d) a pop-up message
29. 29.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
30. 30.Which of these is processing? (a) a pop-up message (b) speaking a command (c) checking a password (d) tapping a button
31. 31.⚙️ What number does this app show?
    let bill = 222; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) speaking a command
33. 33.True or false: adding up a bill is an input. (a) True (b) False
34. 34.⚙️ What number does this app show?
    let price = 420; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.True or false: a buzz (vibration) is processing. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
37. 37.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) sorting the scores (d) speaking a command
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // 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 2 (c) line 3 (d) line 4
39. 39.True or false: working out a tip is processing. (a) True (b) False
40. 40.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);

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