App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 92 · 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 = 65; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
2. 2.Which of these is processing? (a) adding up a bill (b) a result on screen (c) typing your age (d) taking a photo
3. 3.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 95; // 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 4 (b) line 1 (c) line 3 (d) line 2
5. 5.Which of these is an output? (a) a beep sound (b) checking a password (c) tapping a button (d) speaking a command
6. 6.True or false: adding up a bill is an input. (a) True (b) False
7. 7.True or false: adding up a bill is processing. (a) True (b) False
8. 8.True or false: tapping a button is processing. (a) False (b) True
9. 9.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
10. 10.Which of these is an input? (a) a beep sound (b) tapping a button (c) a result on screen (d) sorting the scores
11. 11.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
12. 12.Which of these is an input? (a) taking a photo (b) a pop-up message (c) adding up a bill (d) a beep sound
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 2 (b) line 4 (c) line 1 (d) line 3
14. 14.True or false: adding up a bill is an output. (a) True (b) False
15. 15.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
16. 16.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) checking a password (d) a pop-up message
17. 17.True or false: working out a tip is an input. (a) True (b) False
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
19. 19.⚙️ 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);
20. 20.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) working out a tip (d) taking a photo
21. 21.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
22. 22.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 102; // 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 3 (b) line 4 (c) line 2 (d) line 1
24. 24.True or false: a buzz (vibration) is an output. (a) False (b) True
25. 25.⚙️ 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);
26. 26.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.Which of these is processing? (a) speaking a command (b) tapping a button (c) checking a password (d) taking a photo
28. 28.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 3 (b) line 4 (c) line 2 (d) line 1
30. 30.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.🔍 Which is the odd one out? (a) working out a tip (b) a pop-up message (c) sorting the scores (d) checking a password
32. 32.⚙️ 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 1 (b) line 2 (c) line 3
33. 33.True or false: speaking a command is processing. (a) True (b) False
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 4 (d) line 1
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // typed by the user
    line 2: let qty = 2; // 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
36. 36.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
37. 37.🔍 Which is the odd one out? (a) working out a tip (b) taking a photo (c) typing your age (d) speaking a command
38. 38.Which of these is an input? (a) typing your age (b) a result on screen (c) a pop-up message (d) a beep sound
39. 39.⚙️ 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
40. 40.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input

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