App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 219 · 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.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
2. 2.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
3. 3.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ What number does this app show?
   let km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ What number does this app show?
   let price = 430; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.True or false: taking a photo is an input. (a) True (b) False
8. 8.True or false: taking a photo is processing. (a) True (b) False
9. 9.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
10. 10.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) speaking a command
11. 11.Which of these is processing? (a) adding up a bill (b) a pop-up message (c) a result on screen (d) tapping a button
12. 12.⚙️ What number does this app show?
    let bill = 168; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
14. 14.Which of these is an input? (a) a pop-up message (b) checking a password (c) speaking a command (d) a beep sound
15. 15.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ What number does this app show?
    let bill = 93; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.Which of these is an output? (a) working out a tip (b) adding up a bill (c) a pop-up message (d) sorting the scores
18. 18.True or false: adding up a bill is processing. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) a pop-up message (d) a result on screen
20. 20.🔍 Which is the odd one out? (a) checking a password (b) a buzz (vibration) (c) a beep sound (d) a result on screen
21. 21.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
22. 22.Which of these is processing? (a) speaking a command (b) a buzz (vibration) (c) taking a photo (d) sorting the scores
23. 23.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.Which of these is an input? (a) working out a tip (b) a pop-up message (c) sorting the scores (d) typing your age
26. 26.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 430; // 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 1 (b) line 3 (c) line 4 (d) line 2
29. 29.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) sorting the scores (d) tapping a button
30. 30.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
31. 31.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
32. 32.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a pop-up message (d) adding up a bill
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 244; // 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 4 (c) line 3 (d) line 1
36. 36.⚙️ In an app, is a beep sound 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) typing your age (c) a buzz (vibration) (d) adding up a bill
38. 38.⚙️ What number does this app show?
    let bill = 275; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) sorting the scores (d) a pop-up message
40. 40.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output

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