App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 625 · 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.True or false: speaking a command is an input. (a) False (b) True
2. 2.Which of these is an input? (a) adding up a bill (b) a beep sound (c) a pop-up message (d) taking a photo
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 15; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
4. 4.⚙️ 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 1 (b) line 3 (c) line 2
5. 5.⚙️ What number does this app show?
   let bill = 60; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) typing your age
7. 7.True or false: taking a photo is an input. (a) False (b) True
8. 8.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
9. 9.True or false: a buzz (vibration) is an input. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) tapping a button (d) checking a password
11. 11.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) checking a password (d) working out a tip
12. 12.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
13. 13.True or false: a beep sound is an output. (a) True (b) False
14. 14.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
15. 15.True or false: a buzz (vibration) is processing. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let price = 410; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ 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 2 (b) line 3 (c) line 4 (d) line 1
18. 18.⚙️ 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 2 (b) line 1 (c) line 3
19. 19.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // 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 2 (b) line 3 (c) line 4 (d) line 1
21. 21.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 400; // 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 3 (b) line 4 (c) line 1 (d) line 2
23. 23.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
24. 24.True or false: speaking a command is processing. (a) False (b) True
25. 25.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 2 (b) line 1 (c) line 3 (d) line 4
27. 27.True or false: working out a tip is an input. (a) False (b) True
28. 28.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.True or false: a result on screen is an output. (a) True (b) False
30. 30.Which of these is processing? (a) speaking a command (b) checking a password (c) a pop-up message (d) taking a photo
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 2 (b) line 1 (c) line 4 (d) line 3
32. 32.True or false: sorting the scores is processing. (a) True (b) False
33. 33.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
34. 34.True or false: tapping a button is an output. (a) False (b) True
35. 35.True or false: a pop-up message is processing. (a) False (b) True
36. 36.Which of these is an output? (a) a beep sound (b) tapping a button (c) sorting the scores (d) taking a photo
37. 37.Which of these is an input? (a) checking a password (b) a beep sound (c) speaking a command (d) a buzz (vibration)
38. 38.True or false: tapping a button is an input. (a) False (b) True
39. 39.⚙️ What number does this app show?
    let bill = 46; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input

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