App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 111 · 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) a beep sound (b) typing your age (c) adding up a bill (d) a buzz (vibration)
2. 2.🔍 Which is the odd one out? (a) a pop-up message (b) adding up a bill (c) checking a password (d) sorting the scores
3. 3.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
4. 4.True or false: taking a photo is an output. (a) False (b) True
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // typed by the user
   line 2: let qty = 6; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 4 (b) line 1 (c) line 3 (d) line 2
6. 6.⚙️ What number does this app show?
   let price = 330; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.True or false: taking a photo is an input. (a) False (b) True
9. 9.True or false: adding up a bill is an output. (a) False (b) True
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 240; // 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 3 (b) line 4 (c) line 1 (d) line 2
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // typed by the user
    line 2: let qty = 3; // 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
12. 12.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) typing your age (d) a buzz (vibration)
13. 13.Which of these is an output? (a) sorting the scores (b) taking a photo (c) checking a password (d) a beep sound
14. 14.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) typing your age (d) speaking a command
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 122; // 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 1 (d) line 3
16. 16.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
17. 17.True or false: sorting the scores is an input. (a) False (b) True
18. 18.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.True or false: adding up a bill is an input. (a) True (b) False
20. 20.Which of these is an output? (a) tapping a button (b) a pop-up message (c) taking a photo (d) sorting the scores
21. 21.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) tapping a button (d) taking a photo
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // 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 4 (b) line 2 (c) line 1 (d) line 3
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 1 (c) line 4 (d) line 3
25. 25.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
26. 26.True or false: taking a photo is processing. (a) True (b) False
27. 27.Which of these is an input? (a) a buzz (vibration) (b) working out a tip (c) a beep sound (d) typing your age
28. 28.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a pop-up message (d) adding up a bill
29. 29.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
30. 30.Which of these is an input? (a) a pop-up message (b) a result on screen (c) sorting the scores (d) tapping a button
31. 31.True or false: working out a tip is an output. (a) True (b) False
32. 32.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
33. 33.🔍 Which is the odd one out? (a) a beep sound (b) tapping a button (c) a result on screen (d) a pop-up message
34. 34.Which of these is an output? (a) typing your age (b) working out a tip (c) sorting the scores (d) a result on screen
35. 35.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.True or false: a buzz (vibration) is processing. (a) False (b) True
37. 37.True or false: sorting the scores is processing. (a) False (b) True
38. 38.True or false: a beep sound is an output. (a) True (b) False
39. 39.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 168; // 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 3 (c) line 2 (d) line 4

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