App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 205 · 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 price = 150; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.True or false: sorting the scores is an input. (a) True (b) False
3. 3.Which of these is an output? (a) checking a password (b) adding up a bill (c) taking a photo (d) a pop-up message
4. 4.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) sorting the scores (d) adding up a bill
5. 5.True or false: speaking a command is an output. (a) False (b) True
6. 6.True or false: a pop-up message is an input. (a) False (b) True
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 85; // 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 4 (b) line 3 (c) line 1 (d) line 2
8. 8.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
9. 9.Which of these is an output? (a) sorting the scores (b) checking a password (c) a result on screen (d) tapping a button
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 4 (b) line 1 (c) line 3 (d) line 2
11. 11.⚙️ 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);
12. 12.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
13. 13.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.⚙️ What number does this app show?
    let bill = 92; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.True or false: a result on screen is an output. (a) False (b) True
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
17. 17.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (b) line 1 (c) line 3 (d) line 2
19. 19.⚙️ 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
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 66; // 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 1 (b) line 3 (c) line 4 (d) line 2
21. 21.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
22. 22.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
23. 23.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
24. 24.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) adding up a bill (d) a pop-up message
25. 25.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.True or false: typing your age is an input. (a) False (b) True
27. 27.True or false: taking a photo is processing. (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.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) a buzz (vibration) (d) a pop-up message
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 33; // 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
31. 31.True or false: tapping a button is an input. (a) True (b) False
32. 32.True or false: checking a password is processing. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let bill = 102; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a buzz (vibration) (d) taking a photo
35. 35.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.Which of these is processing? (a) typing your age (b) a beep sound (c) adding up a bill (d) a buzz (vibration)
37. 37.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
38. 38.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
39. 39.🔍 Which is the odd one out? (a) working out a tip (b) a beep sound (c) adding up a bill (d) sorting the scores
40. 40.True or false: speaking a command is an input. (a) True (b) False

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