App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 689 · 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.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
2. 2.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a buzz (vibration)
3. 3.Which of these is processing? (a) speaking a command (b) taking a photo (c) sorting the scores (d) a pop-up message
4. 4.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) taking a photo (d) a pop-up message
5. 5.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
6. 6.Which of these is an input? (a) a result on screen (b) speaking a command (c) sorting the scores (d) a buzz (vibration)
7. 7.🔍 Which is the odd one out? (a) speaking a command (b) a result on screen (c) taking a photo (d) typing your age
8. 8.⚙️ What number does this app show?
   let km = 7; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.Which of these is an input? (a) a buzz (vibration) (b) adding up a bill (c) typing your age (d) a beep sound
10. 10.Which of these is an output? (a) typing your age (b) taking a photo (c) a buzz (vibration) (d) speaking a command
11. 11.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
12. 12.🔍 Which is the odd one out? (a) checking a password (b) taking a photo (c) speaking a command (d) typing your age
13. 13.Which of these is an input? (a) working out a tip (b) a buzz (vibration) (c) sorting the scores (d) taking a photo
14. 14.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
15. 15.True or false: typing your age is an input. (a) True (b) False
16. 16.True or false: speaking a command is an input. (a) False (b) True
17. 17.True or false: typing your age is processing. (a) False (b) True
18. 18.True or false: adding up a bill is processing. (a) False (b) True
19. 19.Which of these is processing? (a) checking a password (b) typing your age (c) speaking a command (d) a beep sound
20. 20.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) working out a tip
21. 21.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
22. 22.🔍 Which is the odd one out? (a) a beep sound (b) tapping a button (c) speaking a command (d) taking a photo
23. 23.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.True or false: taking a photo is processing. (a) True (b) False
26. 26.True or false: taking a photo is an output. (a) True (b) False
27. 27.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
30. 30.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ What number does this app show?
    let bill = 134; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
35. 35.⚙️ 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 4 (b) line 3 (c) line 1 (d) line 2
36. 36.Which of these is an output? (a) a result on screen (b) adding up a bill (c) sorting the scores (d) typing your age
37. 37.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
38. 38.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) a beep sound (d) a pop-up message
39. 39.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) typing your age
40. 40.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input

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