App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 621 · 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 = 69; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.Which of these is an output? (a) sorting the scores (b) a result on screen (c) adding up a bill (d) working out a tip
3. 3.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) tapping a button
4. 4.Which of these is an input? (a) checking a password (b) tapping a button (c) a buzz (vibration) (d) working out a tip
5. 5.True or false: working out a tip is processing. (a) False (b) True
6. 6.True or false: adding up a bill is processing. (a) False (b) True
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 12; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
8. 8.⚙️ What number does this app show?
   let bill = 122; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 268; // 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 2 (b) line 1 (c) line 3 (d) line 4
10. 10.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
11. 11.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
12. 12.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
13. 13.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
14. 14.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) adding up a bill
17. 17.Which of these is processing? (a) a result on screen (b) taking a photo (c) sorting the scores (d) typing your age
18. 18.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
19. 19.True or false: checking a password is an output. (a) True (b) False
20. 20.⚙️ 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 4 (b) line 1 (c) line 2 (d) line 3
21. 21.Which of these is an input? (a) sorting the scores (b) typing your age (c) working out a tip (d) a beep sound
22. 22.Which of these is processing? (a) adding up a bill (b) a beep sound (c) a result on screen (d) a buzz (vibration)
23. 23.⚙️ What number does this app show?
    let bill = 40; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 3 (b) line 4 (c) line 2 (d) line 1
26. 26.True or false: a pop-up message is processing. (a) True (b) False
27. 27.Which of these is an output? (a) sorting the scores (b) working out a tip (c) checking a password (d) a pop-up message
28. 28.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ What number does this app show?
    let bill = 78; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 370; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 2 (c) line 4 (d) line 1
32. 32.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) taking a photo
33. 33.🔍 Which is the odd one out? (a) working out a tip (b) a beep sound (c) a result on screen (d) a pop-up message
34. 34.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a buzz (vibration) (d) taking a photo
35. 35.⚙️ What number does this app show?
    let bill = 105; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.Which of these is processing? (a) a result on screen (b) typing your age (c) a beep sound (d) working out a tip
37. 37.Which of these is an output? (a) checking a password (b) typing your age (c) a buzz (vibration) (d) sorting the scores
38. 38.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ What number does this app show?
    let bill = 153; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.Which of these is an output? (a) a beep sound (b) working out a tip (c) tapping a button (d) checking a password

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