App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 196 · 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 bill = 96; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
3. 3.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 160; // 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 1 (c) line 2 (d) line 3
5. 5.Which of these is an input? (a) a pop-up message (b) adding up a bill (c) typing your age (d) working out a tip
6. 6.Which of these is an input? (a) a pop-up message (b) taking a photo (c) a buzz (vibration) (d) adding up a bill
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 32; // 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 2 (b) line 3 (c) line 1 (d) line 4
8. 8.⚙️ What number does this app show?
   let bill = 36; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) taking a photo (d) a result on screen
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 2 (c) line 1 (d) line 3
11. 11.Which of these is an input? (a) working out a tip (b) checking a password (c) a result on screen (d) tapping a button
12. 12.True or false: working out a tip is processing. (a) True (b) False
13. 13.True or false: checking a password is an output. (a) True (b) False
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 590; // 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 1 (b) line 2 (c) line 3 (d) line 4
15. 15.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
16. 16.True or false: a pop-up message is processing. (a) True (b) False
17. 17.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
18. 18.True or false: checking a password is an input. (a) True (b) False
19. 19.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
20. 20.⚙️ 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 2 (b) line 4 (c) line 1 (d) line 3
21. 21.True or false: sorting the scores is processing. (a) True (b) False
22. 22.True or false: a beep sound is processing. (a) True (b) False
23. 23.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
24. 24.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ What number does this app show?
    let bill = 220; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
27. 27.True or false: speaking a command is an input. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) checking a password (d) a pop-up message
29. 29.Which of these is processing? (a) a beep sound (b) taking a photo (c) a buzz (vibration) (d) adding up a bill
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 1 (b) line 3 (c) line 4 (d) line 2
31. 31.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a buzz (vibration) (d) working out a tip
32. 32.🔍 Which is the odd one out? (a) tapping a button (b) sorting the scores (c) adding up a bill (d) working out a tip
33. 33.Which of these is an output? (a) taking a photo (b) a pop-up message (c) sorting the scores (d) speaking a command
34. 34.⚙️ What number does this app show?
    let bill = 104; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
37. 37.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
38. 38.⚙️ 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 1 (b) line 2 (c) line 3
39. 39.True or false: a result on screen is an input. (a) True (b) False
40. 40.Which of these is an output? (a) working out a tip (b) a beep sound (c) adding up a bill (d) taking a photo

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