App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 271 · 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 of these is processing? (a) speaking a command (b) taking a photo (c) a pop-up message (d) sorting the scores
2. 2.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
3. 3.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) checking a password
4. 4.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 244; // 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 1 (b) line 2 (c) line 4 (d) line 3
6. 6.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) working out a tip (d) tapping a button
7. 7.Which of these is an input? (a) speaking a command (b) a pop-up message (c) adding up a bill (d) sorting the scores
8. 8.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) a buzz (vibration) (d) a pop-up message
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 260; // 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 3 (d) line 1
10. 10.True or false: a pop-up message is processing. (a) True (b) False
11. 11.True or false: working out a tip is an input. (a) True (b) False
12. 12.True or false: taking a photo is an input. (a) False (b) True
13. 13.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
14. 14.Which of these is an output? (a) adding up a bill (b) sorting the scores (c) typing your age (d) a pop-up message
15. 15.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
16. 16.True or false: a beep sound is processing. (a) True (b) False
17. 17.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
18. 18.Which of these is an input? (a) a pop-up message (b) typing your age (c) a result on screen (d) checking a password
19. 19.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) speaking a command (d) typing your age
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
21. 21.Which of these is an input? (a) working out a tip (b) sorting the scores (c) checking a password (d) tapping a button
22. 22.Which of these is processing? (a) a pop-up message (b) working out a tip (c) a buzz (vibration) (d) tapping a button
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 240; // 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 4 (b) line 3 (c) line 2 (d) line 1
24. 24.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
25. 25.True or false: a result on screen is processing. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
27. 27.Which of these is an output? (a) checking a password (b) tapping a button (c) typing your age (d) a beep sound
28. 28.True or false: working out a tip is an output. (a) True (b) False
29. 29.True or false: a pop-up message is an input. (a) False (b) True
30. 30.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) tapping a button (d) checking a password
32. 32.Which of these is an output? (a) working out a tip (b) tapping a button (c) a buzz (vibration) (d) sorting the scores
33. 33.True or false: a beep sound is an input. (a) False (b) True
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 340; // 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 2 (b) line 1 (c) line 3 (d) line 4
35. 35.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
36. 36.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a pop-up message (d) speaking a command
37. 37.True or false: a pop-up message is an output. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) taking a photo (d) typing your age
39. 39.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output

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