App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 911 · 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 processing? (a) tapping a button (b) adding up a bill (c) speaking a command (d) taking a photo
2. 2.True or false: working out a tip is processing. (a) True (b) False
3. 3.⚙️ What number does this app show?
   let km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 520; // 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
6. 6.Which of these is an input? (a) a pop-up message (b) typing your age (c) sorting the scores (d) checking a password
7. 7.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
8. 8.⚙️ What number does this app show?
   let bill = 155; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.True or false: a result on screen is an output. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) typing your age (d) tapping a button
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) typing your age (d) speaking a command
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 2 (c) line 3 (d) line 1
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 2 (b) line 1 (c) line 4 (d) line 3
15. 15.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) checking a password (d) sorting the scores
16. 16.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) taking a photo
17. 17.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
18. 18.True or false: sorting the scores is processing. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
21. 21.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) sorting the scores (d) working out a tip
22. 22.Which of these is an output? (a) tapping a button (b) sorting the scores (c) working out a tip (d) a beep sound
23. 23.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) a pop-up message (d) a buzz (vibration)
24. 24.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
25. 25.⚙️ What number does this app show?
    let bill = 117; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
28. 28.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.⚙️ What number does this app show?
    let bill = 184; // 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 = 340; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.True or false: typing your age is an output. (a) True (b) False
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 1 (b) line 2 (c) line 4 (d) line 3
34. 34.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a pop-up message (d) typing your age
35. 35.🔍 Which is the odd one out? (a) adding up a bill (b) a result on screen (c) checking a password (d) sorting the scores
36. 36.True or false: adding up a bill is an input. (a) False (b) True
37. 37.Which of these is an input? (a) a buzz (vibration) (b) speaking a command (c) a result on screen (d) adding up a bill
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 148; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 3 (c) line 4 (d) line 1
39. 39.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
40. 40.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing

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