App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 970 · 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: sorting the scores is processing. (a) True (b) False
2. 2.⚙️ 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);
3. 3.Which of these is an output? (a) taking a photo (b) adding up a bill (c) typing your age (d) a result on screen
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 34; // 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 1 (b) line 3 (c) line 4 (d) line 2
5. 5.True or false: adding up a bill is an input. (a) True (b) False
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 58; // 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 1 (b) line 3 (c) line 2 (d) line 4
7. 7.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
8. 8.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 510; // typed by the user
   line 2: let off = 50; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 4 (b) line 3 (c) line 2 (d) line 1
10. 10.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) a result on screen (d) a beep sound
12. 12.True or false: a buzz (vibration) is an output. (a) False (b) True
13. 13.True or false: working out a tip is processing. (a) False (b) True
14. 14.Which of these is processing? (a) a buzz (vibration) (b) working out a tip (c) a pop-up message (d) taking a photo
15. 15.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
16. 16.Which of these is an output? (a) typing your age (b) speaking a command (c) taking a photo (d) a buzz (vibration)
17. 17.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) a buzz (vibration) (d) adding up a bill
18. 18.Which of these is an output? (a) checking a password (b) working out a tip (c) tapping a button (d) a pop-up message
19. 19.True or false: typing your age is processing. (a) False (b) True
20. 20.True or false: taking a photo is processing. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) taking a photo (d) speaking a command
22. 22.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 148; // 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 3 (b) line 1 (c) line 4 (d) line 2
24. 24.Which of these is an input? (a) a pop-up message (b) taking a photo (c) checking a password (d) adding up a bill
25. 25.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
26. 26.True or false: taking a photo is an output. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) typing your age
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (d) line 3
29. 29.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.Which of these is an output? (a) taking a photo (b) checking a password (c) tapping a button (d) a beep sound
31. 31.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
32. 32.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) working out a tip (d) a pop-up message
33. 33.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 150; // 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 3 (c) line 1 (d) line 2
35. 35.Which of these is an input? (a) working out a tip (b) a result on screen (c) a buzz (vibration) (d) speaking a command
36. 36.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) sorting the scores (d) taking a photo
37. 37.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.True or false: speaking a command is an input. (a) False (b) True
39. 39.⚙️ 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
40. 40.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output

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