App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 77 · 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 km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
2. 2.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
3. 3.⚙️ 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 3 (b) line 2 (c) line 1
4. 4.⚙️ What number does this app show?
   let bill = 69; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.Which of these is an input? (a) checking a password (b) adding up a bill (c) taking a photo (d) working out a tip
6. 6.True or false: adding up a bill is processing. (a) False (b) True
7. 7.Which of these is processing? (a) typing your age (b) sorting the scores (c) a result on screen (d) speaking a command
8. 8.Which of these is an output? (a) typing your age (b) adding up a bill (c) speaking a command (d) a result on screen
9. 9.Which of these is an input? (a) a buzz (vibration) (b) a pop-up message (c) tapping a button (d) adding up a bill
10. 10.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
11. 11.Which of these is processing? (a) speaking a command (b) typing your age (c) tapping a button (d) checking a password
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 3 (b) line 2 (c) line 4 (d) line 1
13. 13.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) taking a photo (d) speaking a command
14. 14.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
15. 15.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
16. 16.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) adding up a bill (d) typing your age
17. 17.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
20. 20.🔍 Which is the odd one out? (a) a beep sound (b) working out a tip (c) a buzz (vibration) (d) a pop-up message
21. 21.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 560; // 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 2 (b) line 4 (c) line 3 (d) line 1
24. 24.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
26. 26.True or false: checking a password is processing. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) a pop-up message
28. 28.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
29. 29.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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 4 (b) line 2 (c) line 1 (d) line 3
31. 31.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
32. 32.Which of these is an output? (a) sorting the scores (b) tapping a button (c) a buzz (vibration) (d) adding up a bill
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
34. 34.⚙️ 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 1 (b) line 3 (c) line 2
35. 35.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
36. 36.Which of these is an input? (a) checking a password (b) a buzz (vibration) (c) a beep sound (d) typing your age
37. 37.Which of these is processing? (a) adding up a bill (b) taking a photo (c) speaking a command (d) a pop-up message
38. 38.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a pop-up message (d) sorting the scores
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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
40. 40.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);

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