App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 203 · 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 a beep sound an input, processing or an output? (a) input (b) processing (c) output
2. 2.Which of these is an output? (a) a pop-up message (b) speaking a command (c) checking a password (d) tapping a button
3. 3.True or false: typing your age is processing. (a) True (b) False
4. 4.Which of these is processing? (a) typing your age (b) a result on screen (c) adding up a bill (d) a beep sound
5. 5.⚙️ What number does this app show?
   let bill = 140; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ 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
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 24; // 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
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 54; // 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 1 (b) line 3 (c) line 2 (d) line 4
10. 10.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) taking a photo (d) a beep sound
11. 11.Which of these is processing? (a) tapping a button (b) a beep sound (c) a pop-up message (d) sorting the scores
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 1 (c) line 3 (d) line 4
13. 13.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.Which of these is an input? (a) a result on screen (b) working out a tip (c) a pop-up message (d) taking a photo
15. 15.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) a buzz (vibration) (d) a beep sound
16. 16.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
17. 17.True or false: tapping a button is an input. (a) False (b) True
18. 18.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
19. 19.True or false: tapping a button is processing. (a) False (b) True
20. 20.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
21. 21.True or false: a buzz (vibration) is an input. (a) True (b) False
22. 22.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ 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);
24. 24.Which of these is processing? (a) checking a password (b) a buzz (vibration) (c) a result on screen (d) typing your age
25. 25.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
27. 27.True or false: speaking a command is processing. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) working out a tip (b) a result on screen (c) sorting the scores (d) adding up a bill
29. 29.Which of these is an input? (a) a result on screen (b) working out a tip (c) tapping a button (d) a pop-up message
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
31. 31.True or false: a pop-up message is an output. (a) False (b) True
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 3 (c) line 1 (d) line 4
33. 33.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
34. 34.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 2 (b) line 3 (c) line 4 (d) line 1
36. 36.True or false: working out a tip is an output. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
38. 38.Which of these is an input? (a) a result on screen (b) checking a password (c) working out a tip (d) speaking a command
39. 39.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) tapping a button (d) taking a photo
40. 40.True or false: speaking a command is an output. (a) True (b) False

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