App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 298 · 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.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
2. 2.⚙️ What number does this app show?
   let price = 540; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 62; // 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 2 (b) line 4 (c) line 3 (d) line 1
4. 4.Which of these is processing? (a) speaking a command (b) a buzz (vibration) (c) a pop-up message (d) sorting the scores
5. 5.⚙️ What number does this app show?
   let price = 45; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
6. 6.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) checking a password (d) tapping a button
7. 7.⚙️ What number does this app show?
   let price = 410; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 85; // 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
9. 9.Which of these is an output? (a) checking a password (b) a beep sound (c) working out a tip (d) sorting the scores
10. 10.Which of these is an output? (a) checking a password (b) adding up a bill (c) a buzz (vibration) (d) taking a photo
11. 11.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
12. 12.True or false: a result on screen is an output. (a) False (b) True
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 1 (b) line 4 (c) line 3 (d) line 2
14. 14.Which of these is processing? (a) checking a password (b) typing your age (c) taking a photo (d) tapping a button
15. 15.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) a beep sound
17. 17.True or false: taking a photo is an input. (a) True (b) False
18. 18.True or false: sorting the scores is an output. (a) True (b) False
19. 19.Which of these is an input? (a) a result on screen (b) speaking a command (c) adding up a bill (d) sorting the scores
20. 20.True or false: adding up a bill is processing. (a) True (b) False
21. 21.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
22. 22.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a pop-up message (d) tapping a button
23. 23.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
24. 24.True or false: typing your age is an input. (a) False (b) True
25. 25.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 160; // 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 2 (c) line 1 (d) line 4
27. 27.True or false: a pop-up message is an input. (a) False (b) True
28. 28.Which of these is an output? (a) adding up a bill (b) a pop-up message (c) speaking a command (d) tapping a button
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 580; // 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
30. 30.True or false: a beep sound is an input. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a buzz (vibration) (d) working out a tip
32. 32.True or false: speaking a command is processing. (a) True (b) False
33. 33.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
34. 34.Which of these is an output? (a) taking a photo (b) a result on screen (c) speaking a command (d) adding up a bill
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 284; // 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 2 (d) line 4
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // 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 2 (c) line 1 (d) line 4
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 2 (c) line 1 (d) line 4
38. 38.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a buzz (vibration) (d) taking a photo
39. 39.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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

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