App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 712 · 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 taking a photo an input, processing or an output? (a) output (b) input (c) processing
2. 2.Which of these is an output? (a) adding up a bill (b) a result on screen (c) working out a tip (d) tapping a button
3. 3.Which of these is an output? (a) adding up a bill (b) tapping a button (c) checking a password (d) a buzz (vibration)
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 570; // typed by the user
   line 2: let off = 20; // 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
5. 5.True or false: a buzz (vibration) is an output. (a) True (b) False
6. 6.True or false: taking a photo is an output. (a) False (b) True
7. 7.True or false: taking a photo is processing. (a) True (b) False
8. 8.⚙️ 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);
9. 9.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
10. 10.True or false: a pop-up message is an input. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) speaking a command (d) typing your age
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // 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
13. 13.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 560; // 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 3 (c) line 2 (d) line 1
16. 16.True or false: typing your age is processing. (a) False (b) True
17. 17.⚙️ 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 1 (c) line 3
18. 18.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) taking a photo
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 540; // 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 3 (c) line 4 (d) line 2
20. 20.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
21. 21.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
23. 23.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
24. 24.⚙️ 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);
25. 25.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) adding up a bill
26. 26.⚙️ What number does this app show?
    let bill = 104; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
28. 28.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) typing your age (d) a result on screen
30. 30.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) a buzz (vibration) (d) typing your age
31. 31.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.True or false: tapping a button is processing. (a) False (b) True
33. 33.True or false: a pop-up message is processing. (a) True (b) False
34. 34.True or false: speaking a command is an input. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) checking a password (d) tapping a button
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 2 (c) line 4 (d) line 1
37. 37.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
38. 38.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
40. 40.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);

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