App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 770 · 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 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 3 (b) line 2 (c) line 1 (d) line 4
2. 2.Which of these is processing? (a) adding up a bill (b) taking a photo (c) typing your age (d) speaking a command
3. 3.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
4. 4.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) working out a tip (d) speaking a command
5. 5.Which of these is processing? (a) typing your age (b) a buzz (vibration) (c) working out a tip (d) a result on screen
6. 6.True or false: tapping a button is processing. (a) False (b) True
7. 7.True or false: working out a tip is processing. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) checking a password (d) adding up a bill
9. 9.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
10. 10.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) adding up a bill (d) tapping a button
11. 11.⚙️ 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
12. 12.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) adding up a bill (d) working out a tip
13. 13.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
14. 14.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 340; // typed by the user
    line 2: let off = 10; // 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
16. 16.True or false: speaking a command is an output. (a) True (b) False
17. 17.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
19. 19.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
21. 21.Which of these is an output? (a) working out a tip (b) speaking a command (c) tapping a button (d) a buzz (vibration)
22. 22.Which of these is an input? (a) working out a tip (b) typing your age (c) adding up a bill (d) a pop-up message
23. 23.True or false: a result on screen is processing. (a) False (b) True
24. 24.⚙️ What number does this app show?
    let bill = 128; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.Which of these is an output? (a) taking a photo (b) checking a password (c) speaking a command (d) a result on screen
27. 27.True or false: a pop-up message is an output. (a) True (b) False
28. 28.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.True or false: a beep sound is an input. (a) True (b) False
30. 30.True or false: working out a tip is an input. (a) False (b) True
31. 31.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.Which of these is processing? (a) a buzz (vibration) (b) sorting the scores (c) a pop-up message (d) a result on screen
33. 33.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) tapping a button
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // 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 3 (b) line 2 (c) line 1 (d) line 4
35. 35.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a beep sound (d) speaking a command
36. 36.Which of these is an output? (a) adding up a bill (b) a pop-up message (c) sorting the scores (d) speaking a command
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 162; // 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 3 (d) line 2
38. 38.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
40. 40.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) a result on screen (d) working out a tip

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