App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 149 · 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.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
2. 2.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
3. 3.True or false: tapping a button is processing. (a) False (b) True
4. 4.True or false: a result on screen is processing. (a) True (b) False
5. 5.Which of these is an output? (a) adding up a bill (b) a result on screen (c) tapping a button (d) checking a password
6. 6.⚙️ What number does this app show?
   let bill = 164; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.True or false: checking a password is an input. (a) True (b) False
8. 8.True or false: tapping a button is an input. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.True or false: a result on screen is an input. (a) True (b) False
12. 12.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.Which of these is processing? (a) speaking a command (b) typing your age (c) adding up a bill (d) a beep sound
14. 14.Which of these is an input? (a) checking a password (b) a pop-up message (c) a buzz (vibration) (d) typing your age
15. 15.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
16. 16.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) speaking a command (d) typing your age
17. 17.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) sorting the scores (d) working out a tip
20. 20.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
21. 21.Which of these is processing? (a) speaking a command (b) a pop-up message (c) a result on screen (d) working out a tip
22. 22.True or false: typing your age is an input. (a) False (b) True
23. 23.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
24. 24.True or false: speaking a command is an input. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) typing your age (d) tapping a button
26. 26.True or false: taking a photo is an input. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a result on screen (d) typing your age
28. 28.Which of these is an input? (a) checking a password (b) a pop-up message (c) sorting the scores (d) taking a photo
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 38; // 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 2 (c) line 4 (d) line 3
30. 30.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
31. 31.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
32. 32.⚙️ What number does this app show?
    let bill = 142; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.True or false: a beep sound is an output. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) checking a password (d) typing your age
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 230; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 4 (b) line 1 (c) line 3 (d) line 2
37. 37.True or false: adding up a bill is an input. (a) True (b) False
38. 38.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
40. 40.True or false: speaking a command is processing. (a) False (b) True

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