App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 631 · 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 pop-up message (b) sorting the scores (c) a buzz (vibration) (d) a beep sound
2. 2.⚙️ What number does this app show?
   let price = 210; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.True or false: a beep sound is an output. (a) False (b) True
4. 4.True or false: adding up a bill is processing. (a) False (b) True
5. 5.True or false: a result on screen is an output. (a) False (b) True
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 560; // 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
7. 7.🔍 Which is the odd one out? (a) a pop-up message (b) adding up a bill (c) a buzz (vibration) (d) a beep sound
8. 8.Which of these is an input? (a) working out a tip (b) taking a photo (c) adding up a bill (d) checking a password
9. 9.True or false: a pop-up message is processing. (a) True (b) False
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 120; // 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 4 (c) line 2 (d) line 1
11. 11.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) working out a tip (d) adding up a bill
12. 12.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
13. 13.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) tapping a button (d) a result on screen
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 3 (c) line 2 (d) line 1
15. 15.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) checking a password (d) adding up a bill
16. 16.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 100; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 2 (c) line 1 (d) line 4
18. 18.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
19. 19.True or false: taking a photo is an input. (a) True (b) False
20. 20.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
22. 22.Which of these is an output? (a) a buzz (vibration) (b) adding up a bill (c) working out a tip (d) typing your age
23. 23.True or false: working out a tip is processing. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) working out a tip (b) taking a photo (c) typing your age (d) speaking a command
25. 25.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.🔍 Which is the odd one out? (a) taking a photo (b) a result on screen (c) tapping a button (d) typing your age
27. 27.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
28. 28.Which of these is processing? (a) taking a photo (b) checking a password (c) a result on screen (d) a buzz (vibration)
29. 29.⚙️ What number does this app show?
    let bill = 296; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
31. 31.Which of these is processing? (a) adding up a bill (b) speaking a command (c) taking a photo (d) tapping a button
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 365; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 3 (c) line 4 (d) line 1
33. 33.True or false: typing your age is an input. (a) False (b) True
34. 34.True or false: a pop-up message is an input. (a) True (b) False
35. 35.True or false: checking a password is processing. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) speaking a command (d) taking a photo
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 3 (b) line 1 (c) line 2 (d) line 4
38. 38.⚙️ What number does this app show?
    let bill = 380; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
40. 40.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) sorting the scores (d) typing your age

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