App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 589 · 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 a pop-up message an input, processing or an output? (a) input (b) output (c) processing
2. 2.⚙️ What number does this app show?
   let km = 11; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) adding up a bill (d) speaking a command
4. 4.⚙️ What number does this app show?
   let price = 80; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
5. 5.True or false: a result on screen is an input. (a) False (b) True
6. 6.True or false: a buzz (vibration) is processing. (a) False (b) True
7. 7.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
9. 9.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) speaking a command (d) working out a tip
10. 10.Which of these is an output? (a) tapping a button (b) checking a password (c) speaking a command (d) a pop-up message
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 237; // 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 1 (b) line 4 (c) line 3 (d) line 2
12. 12.Which of these is an input? (a) checking a password (b) a beep sound (c) a result on screen (d) typing your age
13. 13.Which of these is an input? (a) checking a password (b) a result on screen (c) tapping a button (d) adding up a bill
14. 14.Which of these is processing? (a) tapping a button (b) taking a photo (c) speaking a command (d) sorting the scores
15. 15.True or false: tapping a button is processing. (a) False (b) True
16. 16.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
17. 17.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
18. 18.True or false: a pop-up message is processing. (a) True (b) False
19. 19.Which of these is an input? (a) sorting the scores (b) a beep sound (c) speaking a command (d) a result on screen
20. 20.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
22. 22.True or false: working out a tip is processing. (a) False (b) True
23. 23.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.True or false: taking a photo is an output. (a) True (b) False
25. 25.⚙️ What number does this app show?
    let bill = 171; // 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 = 450; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 3 (b) line 4 (c) line 1 (d) line 2
31. 31.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 4 (c) line 1 (d) line 2
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) working out a tip (c) tapping a button (d) typing your age
34. 34.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) taking a photo (d) a beep sound
35. 35.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.⚙️ What number does this app show?
    let bill = 305; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.True or false: a buzz (vibration) is an output. (a) True (b) False
38. 38.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.True or false: a pop-up message is an output. (a) False (b) True
40. 40.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing

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