App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 962 · 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: a pop-up message is an input. (a) True (b) False
2. 2.True or false: typing your age is processing. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) a beep sound (d) a buzz (vibration)
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 310; // typed by the user
   line 2: let off = 30; // 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
5. 5.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 480; // 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
7. 7.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
8. 8.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) taking a photo (d) typing your age
9. 9.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
10. 10.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.Which of these is processing? (a) speaking a command (b) a buzz (vibration) (c) taking a photo (d) adding up a bill
12. 12.True or false: checking a password is processing. (a) True (b) False
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
14. 14.⚙️ What number does this app show?
    let bill = 130; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.Which of these is an input? (a) working out a tip (b) speaking a command (c) a buzz (vibration) (d) a pop-up message
16. 16.True or false: typing your age is an input. (a) False (b) True
17. 17.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ 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 3 (c) line 1
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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 4 (b) line 3 (c) line 2 (d) line 1
20. 20.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
21. 21.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 68; // 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 4 (b) line 2 (c) line 1 (d) line 3
23. 23.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
24. 24.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 244; // 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 3 (b) line 2 (c) line 1 (d) line 4
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
27. 27.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) adding up a bill
28. 28.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
29. 29.True or false: taking a photo is an input. (a) False (b) True
30. 30.True or false: working out a tip is processing. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) sorting the scores (d) typing your age
32. 32.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
34. 34.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
35. 35.⚙️ What number does this app show?
    let price = 270; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.True or false: speaking a command is an input. (a) True (b) False
37. 37.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
38. 38.Which of these is an output? (a) tapping a button (b) checking a password (c) typing your age (d) a buzz (vibration)
39. 39.True or false: adding up a bill is an input. (a) True (b) False
40. 40.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);

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