App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 663 · 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.True or false: a pop-up message is an output. (a) True (b) False
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 75; // typed by the user
   line 2: let qty = 2; // 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
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 308; // 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 3 (b) line 1 (c) line 4 (d) line 2
4. 4.True or false: tapping a button is processing. (a) True (b) False
5. 5.Which of these is an output? (a) taking a photo (b) speaking a command (c) typing your age (d) a beep sound
6. 6.True or false: speaking a command is an input. (a) True (b) False
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 160; // 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 3 (d) line 2
8. 8.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
9. 9.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ What number does this app show?
    let bill = 264; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.Which of these is processing? (a) a buzz (vibration) (b) speaking a command (c) checking a password (d) typing your age
12. 12.🔍 Which is the odd one out? (a) a beep sound (b) adding up a bill (c) checking a password (d) working out a tip
13. 13.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) tapping a button (d) adding up a bill
14. 14.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.Which of these is an input? (a) working out a tip (b) a buzz (vibration) (c) typing your age (d) checking a password
16. 16.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
17. 17.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ What number does this app show?
    let bill = 288; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 4 (d) line 1
21. 21.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) speaking a command (d) sorting the scores
22. 22.Which of these is processing? (a) adding up a bill (b) a result on screen (c) a pop-up message (d) a beep sound
23. 23.True or false: a buzz (vibration) is processing. (a) False (b) True
24. 24.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
25. 25.Which of these is an input? (a) speaking a command (b) sorting the scores (c) a pop-up message (d) working out a tip
26. 26.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
27. 27.⚙️ 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 3 (b) line 2 (c) line 1
28. 28.True or false: checking a password is an input. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) sorting the scores (d) working out a tip
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 4 (c) line 2 (d) line 1
31. 31.Which of these is an output? (a) sorting the scores (b) working out a tip (c) tapping a button (d) a pop-up message
32. 32.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
33. 33.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) working out a tip (d) checking a password
34. 34.True or false: taking a photo is an output. (a) True (b) False
35. 35.True or false: a buzz (vibration) is an input. (a) False (b) True
36. 36.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.True or false: a result on screen is an output. (a) True (b) False
38. 38.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
39. 39.True or false: taking a photo is an input. (a) False (b) True
40. 40.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing

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