App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 478 · 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 55; // 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
2. 2.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 40; // 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 2 (b) line 1 (c) line 4 (d) line 3
4. 4.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 90; // 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 3 (b) line 2 (c) line 4 (d) line 1
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 170; // 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 4 (b) line 2 (c) line 3 (d) line 1
7. 7.⚙️ What number does this app show?
   let price = 30; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
8. 8.Which of these is an input? (a) a pop-up message (b) checking a password (c) a beep sound (d) typing your age
9. 9.Which of these is an output? (a) adding up a bill (b) tapping a button (c) speaking a command (d) a result on screen
10. 10.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) checking a password (d) a result on screen
11. 11.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
12. 12.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
13. 13.True or false: a beep sound is an input. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a result on screen (d) speaking a command
15. 15.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) a beep sound (d) a buzz (vibration)
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 162; // 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 1 (b) line 4 (c) line 2 (d) line 3
17. 17.Which of these is processing? (a) a pop-up message (b) a result on screen (c) sorting the scores (d) a beep sound
18. 18.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.True or false: a result on screen is an input. (a) False (b) True
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
21. 21.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) sorting the scores
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 114; // 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 3 (c) line 1 (d) line 4
23. 23.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) a beep sound
24. 24.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) adding up a bill (d) typing your age
26. 26.True or false: working out a tip is an output. (a) False (b) True
27. 27.⚙️ What number does this app show?
    let price = 550; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 168; // 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 4 (c) line 2 (d) line 1
29. 29.True or false: sorting the scores is processing. (a) True (b) False
30. 30.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
31. 31.Which of these is an input? (a) working out a tip (b) sorting the scores (c) checking a password (d) speaking a command
32. 32.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // 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 2 (b) line 1 (c) line 4 (d) line 3
34. 34.Which of these is an input? (a) working out a tip (b) adding up a bill (c) tapping a button (d) checking a password
35. 35.⚙️ What number does this app show?
    let bill = 316; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a result on screen (d) adding up a bill
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 1 (b) line 2 (c) line 3 (d) line 4
38. 38.True or false: a buzz (vibration) is an input. (a) True (b) False
39. 39.⚙️ In an app, is a pop-up message 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 = 35; // 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 2 (b) line 1 (c) line 3 (d) line 4

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