App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 496 · 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 = 130; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ 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 1 (b) line 2 (c) line 4 (d) line 3
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // 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
4. 4.True or false: taking a photo is an input. (a) True (b) False
5. 5.True or false: typing your age is an input. (a) False (b) True
6. 6.True or false: a beep sound is an output. (a) False (b) True
7. 7.⚙️ What number does this app show?
   let price = 75; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 220; // 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 1 (b) line 2 (c) line 3 (d) line 4
9. 9.True or false: taking a photo is processing. (a) False (b) True
10. 10.Which of these is an output? (a) checking a password (b) a buzz (vibration) (c) taking a photo (d) sorting the scores
11. 11.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) working out a tip (d) typing your age
12. 12.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
13. 13.True or false: checking a password is an input. (a) False (b) True
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // typed by the user
    line 2: let qty = 4; // 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
15. 15.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
16. 16.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) working out a tip (d) a result on screen
17. 17.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) typing your age
19. 19.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
20. 20.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
21. 21.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
22. 22.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
23. 23.⚙️ What number does this app show?
    let bill = 124; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
25. 25.Which of these is an input? (a) checking a password (b) a pop-up message (c) typing your age (d) adding up a bill
26. 26.True or false: speaking a command is an output. (a) True (b) False
27. 27.Which of these is processing? (a) speaking a command (b) taking a photo (c) a buzz (vibration) (d) adding up a bill
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // typed by the user
    line 2: let qty = 3; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 2 (c) line 1 (d) line 4
29. 29.True or false: tapping a button is an input. (a) True (b) False
30. 30.Which of these is processing? (a) a beep sound (b) checking a password (c) typing your age (d) tapping a button
31. 31.⚙️ What number does this app show?
    let bill = 24; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.True or false: working out a tip is an output. (a) False (b) True
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 310; // 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 2 (c) line 3 (d) line 1
35. 35.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
36. 36.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.🔍 Which is the odd one out? (a) sorting the scores (b) tapping a button (c) taking a photo (d) speaking a command
38. 38.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a pop-up message (d) working out a tip
39. 39.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
40. 40.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output

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