App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 463 · 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.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
2. 2.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
3. 3.Which of these is processing? (a) a result on screen (b) sorting the scores (c) taking a photo (d) a pop-up message
4. 4.Which of these is processing? (a) a result on screen (b) typing your age (c) speaking a command (d) adding up a bill
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 186; // typed by the user
   line 2: let friends = 3; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 3 (b) line 2 (c) line 1 (d) line 4
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 240; // 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 2 (c) line 3 (d) line 4
7. 7.⚙️ What number does this app show?
   let price = 160; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.True or false: sorting the scores is an input. (a) True (b) False
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 45; // 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 2 (b) line 1 (c) line 4 (d) line 3
10. 10.True or false: typing your age is an output. (a) True (b) False
11. 11.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
12. 12.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
13. 13.🔍 Which is the odd one out? (a) adding up a bill (b) a buzz (vibration) (c) working out a tip (d) checking a password
14. 14.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
15. 15.🔍 Which is the odd one out? (a) a beep sound (b) speaking a command (c) a pop-up message (d) a result on screen
16. 16.⚙️ What number does this app show?
    let bill = 90; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
19. 19.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) speaking a command (d) sorting the scores
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
21. 21.Which of these is an input? (a) a buzz (vibration) (b) a pop-up message (c) tapping a button (d) checking a password
22. 22.⚙️ 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
23. 23.True or false: a beep sound is an output. (a) True (b) False
24. 24.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
26. 26.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) taking a photo (d) a pop-up message
29. 29.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) sorting the scores (d) typing your age
30. 30.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
32. 32.Which of these is an output? (a) working out a tip (b) taking a photo (c) a pop-up message (d) speaking a command
33. 33.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
36. 36.True or false: a pop-up message is an output. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ 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);
39. 39.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) speaking a command (d) typing your age
40. 40.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) working out a tip (d) speaking a command

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