App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 871 · 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 = 120; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 54; // 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 3 (d) line 4
3. 3.True or false: working out a tip is processing. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) typing your age
5. 5.⚙️ What number does this app show?
   let price = 30; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
6. 6.Which of these is an output? (a) adding up a bill (b) sorting the scores (c) speaking a command (d) a buzz (vibration)
7. 7.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) checking a password (d) a buzz (vibration)
8. 8.🔍 Which is the odd one out? (a) sorting the scores (b) a result on screen (c) checking a password (d) adding up a bill
9. 9.True or false: a pop-up message is processing. (a) True (b) False
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 150; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 4 (c) line 2 (d) line 3
11. 11.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) working out a tip (d) tapping a button
12. 12.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) speaking a command (d) a result on screen
13. 13.⚙️ What number does this app show?
    let bill = 134; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) taking a photo (d) typing your age
16. 16.True or false: tapping a button is processing. (a) True (b) False
17. 17.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
18. 18.Which of these is an input? (a) adding up a bill (b) a result on screen (c) working out a tip (d) speaking a command
19. 19.Which of these is an output? (a) taking a photo (b) a result on screen (c) working out a tip (d) typing your age
20. 20.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) sorting the scores (d) working out a tip
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // 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 1 (b) line 2 (c) line 4 (d) line 3
22. 22.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.True or false: checking a password is processing. (a) False (b) True
24. 24.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 1 (b) line 4 (c) line 3 (d) line 2
26. 26.Which of these is an input? (a) checking a password (b) a beep sound (c) working out a tip (d) typing your age
27. 27.True or false: checking a password is an input. (a) False (b) True
28. 28.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.Which of these is processing? (a) a pop-up message (b) sorting the scores (c) tapping a button (d) a result on screen
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 1 (b) line 4 (c) line 2 (d) line 3
31. 31.True or false: typing your age is processing. (a) False (b) True
32. 32.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.True or false: sorting the scores is an input. (a) True (b) False
34. 34.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
35. 35.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
37. 37.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
39. 39.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // 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 2 (b) line 1 (c) line 3 (d) line 4

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