App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 487 · 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) a buzz (vibration) (c) speaking a command (d) a result on screen
2. 2.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a pop-up message (d) tapping a button
3. 3.Which of these is an output? (a) adding up a bill (b) taking a photo (c) a result on screen (d) typing your age
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
5. 5.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
6. 6.Which of these is processing? (a) a beep sound (b) a buzz (vibration) (c) speaking a command (d) adding up a bill
7. 7.True or false: checking a password is processing. (a) False (b) True
8. 8.Which of these is processing? (a) checking a password (b) a buzz (vibration) (c) speaking a command (d) a pop-up message
9. 9.True or false: a pop-up message is an input. (a) False (b) True
10. 10.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 3 (b) line 2 (c) line 4 (d) line 1
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 3 (b) line 1 (c) line 4 (d) line 2
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 1 (c) line 3 (d) line 4
14. 14.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) taking a photo (d) working out a tip
16. 16.Which of these is an input? (a) typing your age (b) adding up a bill (c) a result on screen (d) checking a password
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 530; // 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 1 (c) line 2 (d) line 4
18. 18.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
19. 19.True or false: taking a photo is an input. (a) False (b) True
20. 20.True or false: typing your age is processing. (a) False (b) True
21. 21.True or false: tapping a button is an input. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a buzz (vibration)
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 82; // 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 3 (b) line 4 (c) line 2 (d) line 1
24. 24.True or false: speaking a command is an input. (a) True (b) False
25. 25.⚙️ What number does this app show?
    let bill = 46; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.Which of these is an output? (a) speaking a command (b) working out a tip (c) a buzz (vibration) (d) checking a password
27. 27.⚙️ What number does this app show?
    let bill = 189; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
29. 29.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
31. 31.⚙️ What number does this app show?
    let bill = 220; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
33. 33.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) taking a photo (d) tapping a button
34. 34.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
35. 35.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
36. 36.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) a result on screen (d) a buzz (vibration)
37. 37.True or false: a pop-up message is processing. (a) True (b) False
38. 38.True or false: a result on screen is an input. (a) False (b) True
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 1 (c) line 4 (d) line 3
40. 40.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) typing your age (d) adding up a bill

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