App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 213 · 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) taking a photo (b) speaking a command (c) tapping a button (d) working out a tip
2. 2.⚙️ What number does this app show?
   let km = 5; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
4. 4.Which of these is an input? (a) a result on screen (b) adding up a bill (c) a beep sound (d) speaking a command
5. 5.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) a result on screen (d) a pop-up message
6. 6.⚙️ What number does this app show?
   let price = 510; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
8. 8.True or false: tapping a button is processing. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) taking a photo (d) speaking a command
10. 10.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
12. 12.⚙️ What number does this app show?
    let bill = 30; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.True or false: a beep sound is an output. (a) False (b) True
14. 14.⚙️ 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 2 (c) line 3
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 2 (b) line 1 (c) line 3 (d) line 4
16. 16.True or false: a result on screen is an output. (a) False (b) True
17. 17.True or false: checking a password is processing. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) typing your age (d) a buzz (vibration)
19. 19.True or false: speaking a command is an output. (a) True (b) False
20. 20.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
21. 21.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
22. 22.⚙️ 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 1 (b) line 4 (c) line 2 (d) line 3
23. 23.True or false: working out a tip is processing. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) sorting the scores (d) checking a password
25. 25.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) adding up a bill (d) taking a photo
26. 26.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
28. 28.True or false: working out a tip is an input. (a) True (b) False
29. 29.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
31. 31.Which of these is an output? (a) working out a tip (b) taking a photo (c) a result on screen (d) tapping a button
32. 32.Which of these is processing? (a) a beep sound (b) a pop-up message (c) a result on screen (d) adding up a bill
33. 33.Which of these is an input? (a) adding up a bill (b) a beep sound (c) working out a tip (d) taking a photo
34. 34.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) tapping a button (d) typing your age
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
37. 37.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) a pop-up message (d) a beep sound
38. 38.True or false: working out a tip is an output. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) speaking a command (d) sorting the scores
40. 40.Which of these is processing? (a) a result on screen (b) typing your age (c) a buzz (vibration) (d) working out a tip

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