App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 829 · 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 = 450; // 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 2 (c) line 4 (d) line 3
2. 2.True or false: a beep sound is an input. (a) False (b) True
3. 3.⚙️ What number does this app show?
   let price = 480; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
5. 5.⚙️ What number does this app show?
   let bill = 44; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ What number does this app show?
   let price = 590; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.True or false: tapping a button is processing. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) tapping a button
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 260; // 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 3 (b) line 2 (c) line 4 (d) line 1
10. 10.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
11. 11.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a buzz (vibration) (d) typing your age
12. 12.True or false: typing your age is an input. (a) False (b) True
13. 13.True or false: taking a photo is an output. (a) False (b) True
14. 14.Which of these is an input? (a) a pop-up message (b) sorting the scores (c) typing your age (d) working out a tip
15. 15.True or false: speaking a command is an input. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a pop-up message (b) taking a photo (c) a beep sound (d) a result on screen
17. 17.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // 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 4 (c) line 3 (d) line 2
19. 19.True or false: a buzz (vibration) is an output. (a) False (b) True
20. 20.True or false: typing your age is processing. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a beep sound (b) speaking a command (c) a pop-up message (d) a buzz (vibration)
22. 22.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
23. 23.Which of these is an input? (a) a beep sound (b) working out a tip (c) tapping a button (d) adding up a bill
24. 24.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 230; // 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 2 (b) line 4 (c) line 3 (d) line 1
26. 26.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
27. 27.⚙️ What number does this app show?
    let bill = 70; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.Which of these is an output? (a) taking a photo (b) working out a tip (c) a result on screen (d) sorting the scores
29. 29.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
30. 30.🔍 Which is the odd one out? (a) a buzz (vibration) (b) sorting the scores (c) a result on screen (d) a pop-up message
31. 31.Which of these is processing? (a) speaking a command (b) working out a tip (c) tapping a button (d) a buzz (vibration)
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 102; // 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 2 (c) line 3 (d) line 4
33. 33.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) a beep sound (d) tapping a button
34. 34.True or false: working out a tip is processing. (a) True (b) False
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 4 (b) line 1 (c) line 2 (d) line 3
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 1 (b) line 3 (c) line 2 (d) line 4
37. 37.Which of these is an input? (a) working out a tip (b) taking a photo (c) checking a password (d) a beep sound
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 100; // 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 2 (c) line 4 (d) line 1
39. 39.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a pop-up message (d) speaking a command
40. 40.True or false: a result on screen is an output. (a) True (b) False

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