App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 364 · 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.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) a beep sound (d) checking a password
2. 2.True or false: typing your age is an input. (a) True (b) False
3. 3.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.Which of these is processing? (a) taking a photo (b) a beep sound (c) tapping a button (d) sorting the scores
5. 5.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) speaking a command (d) typing your age
6. 6.Which of these is an input? (a) a beep sound (b) working out a tip (c) tapping a button (d) sorting the scores
7. 7.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ What number does this app show?
   let price = 30; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
9. 9.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
10. 10.Which of these is an input? (a) checking a password (b) speaking a command (c) a buzz (vibration) (d) a pop-up message
11. 11.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) a pop-up message
12. 12.True or false: tapping a button is an input. (a) True (b) False
13. 13.True or false: a pop-up message is an input. (a) True (b) False
14. 14.⚙️ What number does this app show?
    let bill = 108; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) tapping a button
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
17. 17.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
18. 18.True or false: sorting the scores is processing. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let bill = 160; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.Which of these is an input? (a) a result on screen (b) a buzz (vibration) (c) sorting the scores (d) typing your age
22. 22.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
23. 23.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 3 (c) line 2 (d) line 4
25. 25.⚙️ What number does this app show?
    let bill = 146; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.🔍 Which is the odd one out? (a) a beep sound (b) adding up a bill (c) checking a password (d) working out a tip
27. 27.⚙️ What number does this app show?
    let bill = 78; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.True or false: a buzz (vibration) is an output. (a) False (b) True
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 106; // 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 4 (b) line 2 (c) line 3 (d) line 1
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 1 (d) line 4
32. 32.True or false: speaking a command is an input. (a) True (b) False
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 1 (b) line 4 (c) line 2 (d) line 3
34. 34.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) speaking a command
35. 35.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 1 (b) line 2 (c) line 4 (d) line 3
37. 37.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
38. 38.⚙️ What number does this app show?
    let bill = 156; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.True or false: a result on screen is an output. (a) False (b) True
40. 40.⚙️ What number does this app show?
    let bill = 105; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);

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