App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 560 · 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 is the odd one out? (a) a pop-up message (b) speaking a command (c) a buzz (vibration) (d) a result on screen
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 10; // 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 3 (c) line 2 (d) line 1
4. 4.True or false: working out a tip is processing. (a) False (b) True
5. 5.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
6. 6.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) adding up a bill (d) typing your age
7. 7.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
8. 8.Which of these is processing? (a) checking a password (b) taking a photo (c) a pop-up message (d) a buzz (vibration)
9. 9.Which of these is an output? (a) speaking a command (b) a result on screen (c) typing your age (d) working out a tip
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
11. 11.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) tapping a button (d) adding up a bill
12. 12.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) tapping a button
13. 13.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // 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
15. 15.Which of these is an output? (a) tapping a button (b) typing your age (c) speaking a command (d) a beep sound
16. 16.Which of these is processing? (a) working out a tip (b) speaking a command (c) tapping a button (d) typing your age
17. 17.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 4 (b) line 3 (c) line 2 (d) line 1
20. 20.True or false: typing your age is an output. (a) True (b) False
21. 21.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
22. 22.⚙️ 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);
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 280; // 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 2 (c) line 3 (d) line 4
24. 24.Which of these is an input? (a) adding up a bill (b) a result on screen (c) checking a password (d) speaking a command
25. 25.True or false: tapping a button is an input. (a) False (b) True
26. 26.Which of these is an output? (a) tapping a button (b) typing your age (c) speaking a command (d) a pop-up message
27. 27.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) typing your age (d) tapping a button
28. 28.⚙️ 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);
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
30. 30.True or false: a result on screen is processing. (a) False (b) True
31. 31.True or false: a pop-up message is an output. (a) False (b) True
32. 32.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
33. 33.True or false: a beep sound is an output. (a) False (b) True
34. 34.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
35. 35.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
36. 36.Which of these is an output? (a) a buzz (vibration) (b) speaking a command (c) working out a tip (d) sorting the scores
37. 37.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) sorting the scores
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 2 (c) line 4 (d) line 3
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 3 (c) line 4 (d) line 2
40. 40.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);

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