App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 37 · 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 = 440; // 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 3 (c) line 4 (d) line 2
2. 2.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
3. 3.⚙️ What number does this app show?
   let bill = 108; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.🔍 Which is the odd one out? (a) working out a tip (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 11; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
6. 6.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
8. 8.⚙️ What number does this app show?
   let price = 90; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
9. 9.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) sorting the scores (d) typing your age
10. 10.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 3 (d) line 2
12. 12.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
13. 13.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.Which of these is an input? (a) a beep sound (b) adding up a bill (c) checking a password (d) tapping a button
15. 15.Which of these is an output? (a) speaking a command (b) typing your age (c) a beep sound (d) tapping a button
16. 16.True or false: sorting the scores is an output. (a) True (b) False
17. 17.True or false: sorting the scores is an input. (a) True (b) False
18. 18.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // 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 1 (b) line 4 (c) line 3 (d) line 2
20. 20.True or false: a beep sound is processing. (a) False (b) True
21. 21.True or false: speaking a command is an input. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) checking a password (d) a result on screen
23. 23.True or false: adding up a bill is an input. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) speaking a command
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // typed by the user
    line 2: let qty = 5; // 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
26. 26.🔍 Which is the odd one out? (a) working out a tip (b) tapping a button (c) checking a password (d) sorting the scores
27. 27.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) adding up a bill (d) a pop-up message
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 3 (c) line 2 (d) line 1
29. 29.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.Which of these is an input? (a) working out a tip (b) a beep sound (c) a buzz (vibration) (d) taking a photo
33. 33.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 240; // 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 3 (b) line 4 (c) line 1 (d) line 2
35. 35.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
36. 36.True or false: taking a photo is an output. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.True or false: working out a tip is an input. (a) True (b) False
39. 39.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
40. 40.Which of these is an output? (a) taking a photo (b) typing your age (c) sorting the scores (d) a buzz (vibration)

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