App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 385 · 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 = 50; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 15; // 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 1 (b) line 3 (c) line 2 (d) line 4
3. 3.True or false: checking a password is processing. (a) False (b) True
4. 4.True or false: a pop-up message is an output. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) a beep sound
6. 6.True or false: tapping a button is an input. (a) True (b) False
7. 7.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
8. 8.True or false: a buzz (vibration) is an output. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let bill = 160; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.Which of these is processing? (a) adding up a bill (b) taking a photo (c) typing your age (d) a beep sound
11. 11.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ 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 2 (b) line 3 (c) line 1
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
14. 14.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) a buzz (vibration) (d) a beep sound
15. 15.True or false: tapping a button is an output. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a result on screen (d) speaking a command
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
18. 18.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) checking a password
19. 19.Which of these is an input? (a) a result on screen (b) sorting the scores (c) a buzz (vibration) (d) tapping a button
20. 20.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a result on screen (d) working out a tip
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 160; // 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 3 (b) line 2 (c) line 1 (d) line 4
22. 22.⚙️ What number does this app show?
    let bill = 222; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ 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);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 420; // 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 4 (c) line 1 (d) line 2
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 1 (b) line 2 (c) line 3 (d) line 4
27. 27.⚙️ 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);
28. 28.True or false: a pop-up message is an input. (a) True (b) False
29. 29.True or false: a result on screen is an output. (a) False (b) True
30. 30.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
33. 33.Which of these is an input? (a) adding up a bill (b) taking a photo (c) a result on screen (d) a pop-up message
34. 34.True or false: a buzz (vibration) is processing. (a) True (b) False
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 2 (c) line 3 (d) line 4
36. 36.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
37. 37.Which of these is processing? (a) tapping a button (b) working out a tip (c) taking a photo (d) typing your age
38. 38.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
39. 39.True or false: speaking a command is an input. (a) False (b) True
40. 40.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input

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