App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 216 · 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 is the odd one out? (a) adding up a bill (b) a result on screen (c) a buzz (vibration) (d) a beep sound
2. 2.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 225; // typed by the user
   line 2: let friends = 5; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 3 (b) line 1 (c) line 4 (d) line 2
4. 4.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
5. 5.True or false: a beep sound is an input. (a) False (b) True
6. 6.True or false: working out a tip is processing. (a) False (b) True
7. 7.Which of these is an output? (a) a pop-up message (b) speaking a command (c) adding up a bill (d) working out a tip
8. 8.True or false: a result on screen is an input. (a) True (b) False
9. 9.⚙️ What number does this app show?
   let bill = 275; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (c) line 1 (d) line 3
11. 11.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
12. 12.True or false: taking a photo is processing. (a) True (b) False
13. 13.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
14. 14.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) a beep sound
15. 15.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 56; // 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 2 (c) line 1 (d) line 3
17. 17.Which of these is processing? (a) tapping a button (b) a result on screen (c) speaking a command (d) checking a password
18. 18.True or false: tapping a button is an output. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) checking a password (d) a beep sound
20. 20.Which of these is an input? (a) a beep sound (b) a result on screen (c) typing your age (d) a pop-up message
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 68; // 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
22. 22.True or false: checking a password is an output. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) speaking a command (d) sorting the scores
24. 24.Which of these is processing? (a) a result on screen (b) taking a photo (c) sorting the scores (d) a pop-up message
25. 25.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
26. 26.True or false: typing your age is processing. (a) True (b) False
27. 27.True or false: a pop-up message is an input. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) working out a tip (b) a beep sound (c) a buzz (vibration) (d) a pop-up message
29. 29.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
30. 30.Which of these is processing? (a) speaking a command (b) adding up a bill (c) a beep sound (d) a buzz (vibration)
31. 31.True or false: a result on screen is processing. (a) False (b) True
32. 32.True or false: a buzz (vibration) is processing. (a) True (b) False
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 3 (b) line 1 (c) line 2 (d) line 4
34. 34.Which of these is an output? (a) typing your age (b) taking a photo (c) working out a tip (d) a beep sound
35. 35.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
36. 36.True or false: checking a password is processing. (a) False (b) True
37. 37.True or false: tapping a button is processing. (a) True (b) False
38. 38.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
40. 40.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) checking a password (d) a pop-up message

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