App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 401 · 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 an input? (a) adding up a bill (b) a pop-up message (c) working out a tip (d) taking a photo
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 75; // 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 2 (b) line 4 (c) line 3 (d) line 1
3. 3.⚙️ What number does this app show?
   let price = 430; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.True or false: speaking a command is an input. (a) False (b) True
5. 5.True or false: a beep sound is processing. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) sorting the scores (d) a beep sound
7. 7.⚙️ What number does this app show?
   let price = 35; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
8. 8.Which of these is processing? (a) typing your age (b) taking a photo (c) tapping a button (d) working out a tip
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 4 (b) line 1 (c) line 2 (d) line 3
10. 10.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) checking a password
11. 11.True or false: typing your age is an input. (a) True (b) False
12. 12.⚙️ What number does this app show?
    let bill = 76; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) adding up a bill
15. 15.Which of these is an input? (a) typing your age (b) working out a tip (c) a result on screen (d) a buzz (vibration)
16. 16.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
17. 17.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
18. 18.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) sorting the scores (d) a result on screen
19. 19.Which of these is an input? (a) adding up a bill (b) a result on screen (c) a beep sound (d) speaking a command
20. 20.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
21. 21.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) working out a tip (d) a beep sound
22. 22.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
23. 23.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
24. 24.True or false: tapping a button is processing. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a beep sound (b) taking a photo (c) a pop-up message (d) a buzz (vibration)
26. 26.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
27. 27.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.True or false: taking a photo is an input. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
30. 30.Which of these is an output? (a) typing your age (b) adding up a bill (c) sorting the scores (d) a pop-up message
31. 31.⚙️ What number does this app show?
    let bill = 234; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.⚙️ What number does this app show?
    let bill = 144; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) working out a tip (d) sorting the scores
35. 35.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
36. 36.True or false: a pop-up message is an output. (a) False (b) True
37. 37.True or false: adding up a bill is an output. (a) True (b) False
38. 38.Which of these is processing? (a) a result on screen (b) a pop-up message (c) typing your age (d) sorting the scores
39. 39.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
40. 40.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing

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