App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 198 · 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.True or false: a buzz (vibration) is an output. (a) False (b) True
2. 2.Which of these is an output? (a) tapping a button (b) working out a tip (c) a buzz (vibration) (d) taking a photo
3. 3.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
4. 4.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) working out a tip (d) speaking a command
5. 5.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) checking a password (d) working out a tip
6. 6.⚙️ What number does this app show?
   let price = 35; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
8. 8.Which of these is processing? (a) a result on screen (b) a pop-up message (c) a beep sound (d) adding up a bill
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 200; // typed by the user
   line 2: let off = 30; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 4 (b) line 1 (c) line 2 (d) line 3
10. 10.True or false: adding up a bill is processing. (a) False (b) True
11. 11.Which of these is processing? (a) taking a photo (b) tapping a button (c) a beep sound (d) working out a tip
12. 12.⚙️ What number does this app show?
    let bill = 204; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) tapping a button (d) sorting the scores
15. 15.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.True or false: speaking a command is an output. (a) True (b) False
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 4 (c) line 2 (d) line 3
18. 18.Which of these is an output? (a) speaking a command (b) a result on screen (c) taking a photo (d) tapping a button
19. 19.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) a pop-up message (d) a beep sound
21. 21.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 250; // 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 4 (b) line 2 (c) line 3 (d) line 1
23. 23.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
24. 24.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) typing your age (d) speaking a command
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 1 (b) line 2 (c) line 4 (d) line 3
26. 26.Which of these is processing? (a) a beep sound (b) taking a photo (c) a buzz (vibration) (d) checking a password
27. 27.⚙️ What number does this app show?
    let bill = 207; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 390; // 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 1 (d) line 4
29. 29.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
30. 30.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
31. 31.🔍 Which is the odd one out? (a) a beep sound (b) taking a photo (c) tapping a button (d) speaking a command
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 3 (c) line 4 (d) line 2
33. 33.⚙️ What number does this app show?
    let bill = 140; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
35. 35.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.True or false: a buzz (vibration) is an input. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let bill = 276; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.Which of these is an output? (a) a pop-up message (b) adding up a bill (c) taking a photo (d) typing your age
39. 39.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 3 (b) line 2 (c) line 4 (d) line 1

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