App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 518 · 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.⚙️ 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 3 (b) line 2 (c) line 4 (d) line 1
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
4. 4.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 15; // 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 3 (d) line 1
6. 6.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.🔍 Which is the odd one out? (a) working out a tip (b) a pop-up message (c) sorting the scores (d) adding up a bill
8. 8.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
9. 9.⚙️ What number does this app show?
   let bill = 58; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ What number does this app show?
    let bill = 34; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.True or false: typing your age is an input. (a) True (b) False
12. 12.Which of these is an input? (a) working out a tip (b) a beep sound (c) a result on screen (d) typing your age
13. 13.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) a beep sound
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 48; // 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 4 (b) line 2 (c) line 3 (d) line 1
16. 16.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ What number does this app show?
    let bill = 140; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
20. 20.⚙️ What number does this app show?
    let bill = 117; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.True or false: adding up a bill is an output. (a) True (b) False
22. 22.Which of these is processing? (a) a beep sound (b) taking a photo (c) working out a tip (d) typing your age
23. 23.True or false: sorting the scores is an input. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) speaking a command (d) a buzz (vibration)
25. 25.True or false: a result on screen is an input. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) speaking a command (d) working out a tip
27. 27.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
29. 29.Which of these is an input? (a) a result on screen (b) sorting the scores (c) a buzz (vibration) (d) speaking a command
30. 30.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
32. 32.🔍 Which is the odd one out? (a) a pop-up message (b) checking a password (c) a beep sound (d) a buzz (vibration)
33. 33.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 99; // 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 2 (b) line 4 (c) line 1 (d) line 3
36. 36.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
37. 37.Which of these is processing? (a) adding up a bill (b) taking a photo (c) a result on screen (d) typing your age
38. 38.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.⚙️ What number does this app show?
    let price = 330; // 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