App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 400 · 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 = 138; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
3. 3.Which of these is processing? (a) a pop-up message (b) working out a tip (c) speaking a command (d) a buzz (vibration)
4. 4.Which of these is an input? (a) a buzz (vibration) (b) tapping a button (c) sorting the scores (d) a pop-up message
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 230; // 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 1 (b) line 2 (c) line 4 (d) line 3
6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
7. 7.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 14; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 510; // 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 4 (b) line 2 (c) line 3 (d) line 1
10. 10.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: working out a tip is processing. (a) False (b) True
13. 13.Which of these is an output? (a) checking a password (b) a result on screen (c) tapping a button (d) adding up a bill
14. 14.True or false: a beep sound is processing. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) checking a password (d) a pop-up message
16. 16.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let bill = 135; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.⚙️ What number does this app show?
    let bill = 260; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
20. 20.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) speaking a command (d) a buzz (vibration)
21. 21.⚙️ 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);
22. 22.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
23. 23.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
24. 24.True or false: a buzz (vibration) is processing. (a) False (b) True
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 4 (b) line 1 (c) line 3 (d) line 2
26. 26.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
27. 27.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
28. 28.Which of these is an output? (a) speaking a command (b) checking a password (c) a pop-up message (d) adding up a bill
29. 29.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) adding up a bill (d) speaking a command
30. 30.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) sorting the scores (d) working out a tip
31. 31.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 320; // 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 4 (b) line 3 (c) line 2 (d) line 1
33. 33.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
37. 37.Which of these is an output? (a) sorting the scores (b) a buzz (vibration) (c) checking a password (d) typing your age
38. 38.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a buzz (vibration)
39. 39.⚙️ What number does this app show?
    let bill = 190; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);

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