App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 27 · 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 = 380; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // 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
5. 5.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) tapping a button (d) sorting the scores
6. 6.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
7. 7.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
8. 8.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.True or false: a result on screen is an output. (a) True (b) False
10. 10.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
11. 11.Which of these is an input? (a) a beep sound (b) adding up a bill (c) typing your age (d) a pop-up message
12. 12.True or false: a beep sound is an output. (a) False (b) True
13. 13.Which of these is an input? (a) a pop-up message (b) adding up a bill (c) sorting the scores (d) tapping a button
14. 14.True or false: sorting the scores is processing. (a) True (b) False
15. 15.True or false: checking a password is processing. (a) False (b) True
16. 16.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
17. 17.Which of these is processing? (a) a result on screen (b) a beep sound (c) working out a tip (d) taking a photo
18. 18.🔍 Which is the odd one out? (a) sorting the scores (b) a buzz (vibration) (c) a beep sound (d) a result on screen
19. 19.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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
22. 22.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) adding up a bill (d) sorting the scores
24. 24.Which of these is processing? (a) taking a photo (b) tapping a button (c) adding up a bill (d) a result on screen
25. 25.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
26. 26.Which of these is an input? (a) taking a photo (b) a buzz (vibration) (c) working out a tip (d) checking a password
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // 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 2 (b) line 3 (c) line 4 (d) line 1
28. 28.⚙️ 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 4 (b) line 3 (c) line 2 (d) line 1
29. 29.⚙️ What number does this app show?
    let bill = 316; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ 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);
32. 32.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) working out a tip
34. 34.Which of these is processing? (a) a pop-up message (b) taking a photo (c) sorting the scores (d) a result on screen
35. 35.Which of these is processing? (a) checking a password (b) a result on screen (c) taking a photo (d) a buzz (vibration)
36. 36.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ 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 2 (b) line 1 (c) line 3
38. 38.True or false: speaking a command is processing. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 3 (c) line 4 (d) line 1
40. 40.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output

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