App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 522 · 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.⚙️ What number does this app show?
   let bill = 325; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ What number does this app show?
   let price = 210; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.True or false: checking a password is an output. (a) True (b) False
4. 4.True or false: speaking a command is an input. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 50; // 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 4 (c) line 3 (d) line 1
6. 6.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a beep sound (d) sorting the scores
7. 7.⚙️ What number does this app show?
   let km = 8; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.True or false: taking a photo is processing. (a) True (b) False
9. 9.⚙️ What number does this app show?
   let price = 45; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
10. 10.Which of these is an input? (a) a pop-up message (b) sorting the scores (c) speaking a command (d) a beep sound
11. 11.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.Which of these is an input? (a) a buzz (vibration) (b) a beep sound (c) checking a password (d) typing your age
13. 13.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
14. 14.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.Which of these is processing? (a) a pop-up message (b) adding up a bill (c) speaking a command (d) a beep sound
16. 16.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 250; // 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 1 (b) line 3 (c) line 4 (d) line 2
18. 18.True or false: speaking a command is processing. (a) False (b) True
19. 19.True or false: working out a tip is processing. (a) False (b) True
20. 20.Which of these is processing? (a) speaking a command (b) a buzz (vibration) (c) a pop-up message (d) checking a password
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 3 (c) line 4 (d) line 2
22. 22.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) a result on screen (d) a pop-up message
23. 23.🔍 Which is the odd one out? (a) tapping a button (b) a pop-up message (c) taking a photo (d) typing your age
24. 24.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) sorting the scores (d) a beep sound
25. 25.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.True or false: a result on screen is an output. (a) False (b) True
27. 27.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
28. 28.Which of these is an output? (a) adding up a bill (b) checking a password (c) speaking a command (d) a result on screen
29. 29.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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
31. 31.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
32. 32.True or false: tapping a button is an input. (a) True (b) False
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.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
35. 35.Which of these is an input? (a) working out a tip (b) adding up a bill (c) a beep sound (d) tapping a button
36. 36.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
37. 37.Which of these is processing? (a) typing your age (b) sorting the scores (c) a pop-up message (d) tapping a button
38. 38.True or false: a buzz (vibration) is an input. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a buzz (vibration) (d) tapping a button
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 88; // 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 1 (c) line 4 (d) line 3

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