App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 21 · 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 = 30; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.True or false: a beep sound is processing. (a) False (b) True
4. 4.⚙️ What number does this app show?
   let bill = 65; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.True or false: typing your age is an input. (a) False (b) True
6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
7. 7.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
8. 8.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // typed by the user
   line 2: let qty = 3; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 2 (b) line 4 (c) line 3 (d) line 1
10. 10.True or false: a beep sound is an input. (a) False (b) True
11. 11.⚙️ What number does this app show?
    let bill = 30; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 4 (c) line 1 (d) line 3
13. 13.True or false: tapping a button is an output. (a) True (b) False
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 196; // 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 3 (b) line 1 (c) line 2 (d) line 4
15. 15.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
16. 16.True or false: tapping a button is processing. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a buzz (vibration) (b) tapping a button (c) a pop-up message (d) a result on screen
18. 18.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ What number does this app show?
    let bill = 201; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 1 (b) line 2 (c) line 3 (d) line 4
22. 22.Which of these is an output? (a) speaking a command (b) checking a password (c) a buzz (vibration) (d) typing your age
23. 23.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 224; // 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 1 (b) line 4 (c) line 3 (d) line 2
26. 26.⚙️ What number does this app show?
    let bill = 154; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a result on screen (d) sorting the scores
29. 29.⚙️ 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 1 (b) line 4 (c) line 2 (d) line 3
30. 30.True or false: speaking a command is processing. (a) False (b) True
31. 31.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
32. 32.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a buzz (vibration) (d) working out a tip
33. 33.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) a beep sound (d) sorting the scores
34. 34.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) adding up a bill (d) sorting the scores
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 201; // 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 2 (c) line 4 (d) line 3
36. 36.True or false: checking a password is an output. (a) True (b) False
37. 37.True or false: a buzz (vibration) is an output. (a) True (b) False
38. 38.True or false: typing your age is an output. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) working out a tip (d) sorting the scores
40. 40.True or false: a buzz (vibration) is processing. (a) False (b) True

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