App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 549 · 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 = 80; // 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 4 (c) line 3 (d) line 1
2. 2.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
3. 3.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a pop-up message (d) speaking a command
4. 4.True or false: a result on screen is an output. (a) False (b) True
5. 5.⚙️ What number does this app show?
   let km = 14; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
7. 7.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
9. 9.True or false: a pop-up message is processing. (a) True (b) False
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // typed by the user
    line 2: let qty = 3; // 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
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 4 (b) line 3 (c) line 1 (d) line 2
12. 12.True or false: a beep sound is an input. (a) True (b) False
13. 13.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
14. 14.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
16. 16.⚙️ 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);
17. 17.True or false: tapping a button is an input. (a) False (b) True
18. 18.Which of these is processing? (a) tapping a button (b) adding up a bill (c) a buzz (vibration) (d) taking a photo
19. 19.Which of these is an output? (a) tapping a button (b) working out a tip (c) sorting the scores (d) a result on screen
20. 20.Which of these is an output? (a) a beep sound (b) tapping a button (c) adding up a bill (d) taking a photo
21. 21.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
22. 22.True or false: sorting the scores is processing. (a) False (b) True
23. 23.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
25. 25.Which of these is an input? (a) a pop-up message (b) adding up a bill (c) taking a photo (d) checking a password
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 250; // 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
27. 27.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.Which of these is an input? (a) checking a password (b) typing your age (c) adding up a bill (d) sorting the scores
30. 30.True or false: a buzz (vibration) is an output. (a) False (b) True
31. 31.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
32. 32.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) a buzz (vibration) (d) a beep sound
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 200; // 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 3 (c) line 1 (d) line 2
34. 34.True or false: checking a password is processing. (a) True (b) False
35. 35.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.⚙️ 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 4 (c) line 2 (d) line 3
37. 37.Which of these is processing? (a) a result on screen (b) checking a password (c) tapping a button (d) speaking a command
38. 38.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
39. 39.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
40. 40.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);

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