App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 709 · 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.True or false: checking a password is processing. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let bill = 183; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.True or false: a pop-up message is an input. (a) True (b) False
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 390; // 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 4 (c) line 1 (d) line 3
5. 5.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
6. 6.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) checking a password
8. 8.True or false: a result on screen is processing. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let price = 170; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
11. 11.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ 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 3 (c) line 2
13. 13.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.Which of these is an input? (a) typing your age (b) adding up a bill (c) a result on screen (d) checking a password
17. 17.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) a pop-up message (d) a result on screen
18. 18.True or false: speaking a command is an input. (a) True (b) False
19. 19.True or false: tapping a button is an input. (a) True (b) False
20. 20.Which of these is an input? (a) working out a tip (b) tapping a button (c) a result on screen (d) a pop-up message
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 1 (d) line 3
22. 22.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
23. 23.True or false: taking a photo is an output. (a) True (b) False
24. 24.Which of these is processing? (a) a beep sound (b) speaking a command (c) typing your age (d) working out a tip
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 510; // 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 1 (c) line 3 (d) line 2
27. 27.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
28. 28.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
30. 30.🔍 Which is the odd one out? (a) sorting the scores (b) a result on screen (c) adding up a bill (d) checking a password
31. 31.True or false: working out a tip is an output. (a) True (b) False
32. 32.True or false: tapping a button is an output. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
34. 34.True or false: a beep sound is an input. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) working out a tip (d) a result on screen
36. 36.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) a buzz (vibration) (d) a beep sound
38. 38.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
39. 39.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) taking a photo
40. 40.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) a beep sound (d) typing your age

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