App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 331 · 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 is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) adding up a bill
2. 2.Which of these is an input? (a) a buzz (vibration) (b) adding up a bill (c) typing your age (d) a pop-up message
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // typed by the user
   line 2: let qty = 5; // 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
4. 4.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) taking a photo (d) speaking a command
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 400; // 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 1 (b) line 4 (c) line 2 (d) line 3
6. 6.🔍 Which is the odd one out? (a) sorting the scores (b) speaking a command (c) working out a tip (d) adding up a bill
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 150; // 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 4 (b) line 2 (c) line 1 (d) line 3
8. 8.⚙️ What number does this app show?
   let bill = 219; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
10. 10.True or false: a beep sound is an output. (a) True (b) False
11. 11.⚙️ What number does this app show?
    let bill = 124; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 4 (b) line 3 (c) line 1 (d) line 2
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // 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 3 (b) line 1 (c) line 4 (d) line 2
14. 14.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) typing your age (d) speaking a command
16. 16.Which of these is processing? (a) a result on screen (b) adding up a bill (c) a beep sound (d) typing your age
17. 17.⚙️ 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);
18. 18.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) speaking a command (d) taking a photo
19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
20. 20.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
21. 21.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a beep sound (d) typing your age
22. 22.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 140; // 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 4 (b) line 2 (c) line 1 (d) line 3
24. 24.⚙️ What number does this app show?
    let bill = 42; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) typing your age
27. 27.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
28. 28.True or false: typing your age is processing. (a) False (b) True
29. 29.Which of these is processing? (a) sorting the scores (b) a result on screen (c) tapping a button (d) typing your age
30. 30.⚙️ 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 3 (b) line 2 (c) line 1 (d) line 4
31. 31.Which of these is processing? (a) tapping a button (b) taking a photo (c) checking a password (d) a pop-up message
32. 32.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
33. 33.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a pop-up message
34. 34.Which of these is an output? (a) typing your age (b) tapping a button (c) a beep sound (d) taking a photo
35. 35.True or false: taking a photo is an output. (a) True (b) False
36. 36.True or false: a pop-up message is an input. (a) False (b) True
37. 37.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
38. 38.Which of these is an output? (a) typing your age (b) checking a password (c) working out a tip (d) a result on screen
39. 39.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) working out a tip (d) a result on screen

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