App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 723 · 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 price = 480; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ 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 3 (b) line 2 (c) line 1
3. 3.True or false: a beep sound is processing. (a) False (b) True
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 50; // typed by the user
   line 2: let friends = 5; // 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
5. 5.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
6. 6.⚙️ What number does this app show?
   let price = 510; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 25; // 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 4 (b) line 3 (c) line 2 (d) line 1
9. 9.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) adding up a bill (d) a buzz (vibration)
10. 10.Which of these is processing? (a) speaking a command (b) typing your age (c) tapping a button (d) adding up a bill
11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
12. 12.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.True or false: sorting the scores is processing. (a) True (b) False
15. 15.Which of these is an input? (a) typing your age (b) a beep sound (c) a result on screen (d) adding up a bill
16. 16.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
17. 17.Which of these is an output? (a) sorting the scores (b) a beep sound (c) typing your age (d) taking a photo
18. 18.True or false: speaking a command is processing. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) typing your age (d) tapping a button
20. 20.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.True or false: a result on screen is an input. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) tapping a button (d) a result on screen
23. 23.True or false: checking a password is processing. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) a pop-up message (d) a beep sound
25. 25.⚙️ 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);
26. 26.Which of these is an output? (a) sorting the scores (b) a result on screen (c) taking a photo (d) adding up a bill
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 142; // 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 3 (d) line 1
28. 28.Which of these is processing? (a) taking a photo (b) tapping a button (c) a pop-up message (d) working out a tip
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 4 (b) line 2 (c) line 1 (d) line 3
30. 30.Which of these is processing? (a) a beep sound (b) checking a password (c) tapping a button (d) a buzz (vibration)
31. 31.⚙️ What number does this app show?
    let bill = 325; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
33. 33.Which of these is processing? (a) sorting the scores (b) typing your age (c) a result on screen (d) speaking a command
34. 34.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
36. 36.True or false: typing your age is processing. (a) True (b) False
37. 37.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
38. 38.⚙️ What number does this app show?
    let bill = 52; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 1 (c) line 3 (d) line 2
40. 40.Which of these is an input? (a) adding up a bill (b) a beep sound (c) a buzz (vibration) (d) taking a photo

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