App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 531 · 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 = 60; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
2. 2.Which of these is processing? (a) a beep sound (b) a pop-up message (c) checking a password (d) typing your age
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
4. 4.True or false: a result on screen is an output. (a) False (b) True
5. 5.⚙️ 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);
6. 6.True or false: adding up a bill is an output. (a) True (b) False
7. 7.True or false: sorting the scores is an output. (a) False (b) True
8. 8.Which of these is an output? (a) taking a photo (b) typing your age (c) sorting the scores (d) a result on screen
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 2 (c) line 1 (d) line 3
10. 10.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a buzz (vibration)
11. 11.Which of these is processing? (a) adding up a bill (b) tapping a button (c) a result on screen (d) typing your age
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 1 (b) line 4 (c) line 3 (d) line 2
13. 13.⚙️ 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);
14. 14.🔍 Which is the odd one out? (a) speaking a command (b) a result on screen (c) tapping a button (d) typing your age
15. 15.True or false: a beep sound is an output. (a) True (b) False
16. 16.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
17. 17.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) adding up a bill (d) tapping a button
18. 18.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
19. 19.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
20. 20.True or false: working out a tip is processing. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
22. 22.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) tapping a button (d) checking a password
23. 23.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) speaking a command (d) a pop-up message
24. 24.🔍 Which is the odd one out? (a) a pop-up message (b) checking a password (c) sorting the scores (d) working out a tip
25. 25.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.True or false: a pop-up message is an output. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 3 (b) line 4 (c) line 1 (d) line 2
28. 28.⚙️ What number does this app show?
    let bill = 66; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // typed by the user
    line 2: let qty = 6; // 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
30. 30.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
31. 31.⚙️ 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 3 (b) line 1 (c) line 2
32. 32.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) taking a photo (d) a pop-up message
33. 33.⚙️ 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);
34. 34.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
36. 36.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
38. 38.Which of these is an output? (a) a pop-up message (b) typing your age (c) speaking a command (d) taking a photo
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
40. 40.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing

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