App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 202 · 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 = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.Which of these is an output? (a) a result on screen (b) checking a password (c) speaking a command (d) taking a photo
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 106; // 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 3 (c) line 1 (d) line 2
4. 4.⚙️ What number does this app show?
   let price = 200; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.True or false: a beep sound is an output. (a) True (b) False
6. 6.True or false: taking a photo is an input. (a) True (b) False
7. 7.True or false: checking a password is an input. (a) True (b) False
8. 8.True or false: checking a password is processing. (a) True (b) False
9. 9.⚙️ 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);
10. 10.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 88; // 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 1 (c) line 2 (d) line 3
12. 12.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
13. 13.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
14. 14.True or false: a result on screen is processing. (a) True (b) False
15. 15.Which of these is an output? (a) taking a photo (b) working out a tip (c) typing your age (d) a buzz (vibration)
16. 16.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) a buzz (vibration) (d) checking a password
17. 17.Which of these is processing? (a) a result on screen (b) sorting the scores (c) a buzz (vibration) (d) a beep sound
18. 18.Which of these is an output? (a) typing your age (b) a pop-up message (c) checking a password (d) tapping a button
19. 19.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
20. 20.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) adding up a bill (d) taking a photo
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 93; // 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
23. 23.🔍 Which is the odd one out? (a) a beep sound (b) speaking a command (c) typing your age (d) taking a photo
24. 24.Which of these is an input? (a) adding up a bill (b) speaking a command (c) sorting the scores (d) checking a password
25. 25.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
27. 27.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
29. 29.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a result on screen (d) checking a password
30. 30.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.Which of these is an input? (a) adding up a bill (b) a buzz (vibration) (c) taking a photo (d) sorting the scores
32. 32.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a result on screen (d) typing your age
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 136; // 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 1 (b) line 2 (c) line 4 (d) line 3
35. 35.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
36. 36.True or false: a buzz (vibration) is an output. (a) True (b) False
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (b) line 3 (c) line 1 (d) line 4
38. 38.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
39. 39.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
40. 40.Which of these is processing? (a) checking a password (b) a buzz (vibration) (c) typing your age (d) a pop-up message

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