App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 137 · 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 km = 14; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.True or false: a buzz (vibration) is an output. (a) False (b) True
3. 3.Which of these is an input? (a) checking a password (b) typing your age (c) a pop-up message (d) a buzz (vibration)
4. 4.True or false: working out a tip is an output. (a) True (b) False
5. 5.True or false: typing your age is processing. (a) True (b) False
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 500; // 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 3 (b) line 1 (c) line 2 (d) line 4
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 3 (c) line 4 (d) line 1
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 430; // 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 2 (b) line 1 (c) line 3 (d) line 4
9. 9.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 78; // 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 4 (d) line 1
11. 11.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
13. 13.True or false: taking a photo is an input. (a) False (b) True
14. 14.True or false: speaking a command is an output. (a) False (b) True
15. 15.True or false: checking a password is an output. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) taking a photo (d) speaking a command
17. 17.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
19. 19.Which of these is an input? (a) sorting the scores (b) adding up a bill (c) a result on screen (d) taking a photo
20. 20.🔍 Which is the odd one out? (a) working out a tip (b) a result on screen (c) a beep sound (d) a pop-up message
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 2 (b) line 1 (c) line 3 (d) line 4
22. 22.⚙️ 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 3 (c) line 2
23. 23.⚙️ What number does this app show?
    let bill = 290; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 4 (b) line 3 (c) line 1 (d) line 2
25. 25.🔍 Which is the odd one out? (a) sorting the scores (b) a beep sound (c) a result on screen (d) a buzz (vibration)
26. 26.True or false: a result on screen is processing. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 4 (b) line 3 (c) line 1 (d) line 2
28. 28.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) a buzz (vibration)
29. 29.True or false: a pop-up message is an output. (a) True (b) False
30. 30.True or false: tapping a button is processing. (a) True (b) False
31. 31.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
32. 32.True or false: tapping a button is an input. (a) False (b) True
33. 33.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
34. 34.Which of these is an output? (a) sorting the scores (b) checking a password (c) a pop-up message (d) taking a photo
35. 35.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (c) line 2 (d) line 3
37. 37.True or false: a beep sound is an output. (a) True (b) False
38. 38.True or false: sorting the scores is processing. (a) True (b) False
39. 39.Which of these is an output? (a) a result on screen (b) working out a tip (c) speaking a command (d) sorting the scores
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 123; // 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 2 (c) line 1 (d) line 4

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