App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 614 · 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 pop-up message is processing. (a) False (b) True
2. 2.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
3. 3.True or false: typing your age is an output. (a) True (b) False
4. 4.Which of these is an output? (a) a beep sound (b) typing your age (c) sorting the scores (d) checking a password
5. 5.Which of these is an output? (a) a buzz (vibration) (b) taking a photo (c) working out a tip (d) typing your age
6. 6.Which of these is an input? (a) typing your age (b) a beep sound (c) checking a password (d) sorting the scores
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 price = 270; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // 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 1 (d) line 3
10. 10.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
11. 11.⚙️ What number does this app show?
    let bill = 216; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.True or false: speaking a command is processing. (a) False (b) True
13. 13.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
16. 16.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
17. 17.Which of these is an input? (a) adding up a bill (b) a result on screen (c) a pop-up message (d) taking a photo
18. 18.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
19. 19.⚙️ What number does this app show?
    let bill = 75; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ 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
22. 22.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.Which of these is processing? (a) sorting the scores (b) a pop-up message (c) typing your age (d) tapping a button
24. 24.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.Which of these is processing? (a) a pop-up message (b) adding up a bill (c) typing your age (d) a result on screen
26. 26.True or false: speaking a command is an input. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) taking a photo (b) a result on screen (c) typing your age (d) speaking a command
28. 28.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a beep sound (d) checking a password
30. 30.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 2 (c) line 3 (d) line 4
32. 32.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
33. 33.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) adding up a bill (d) checking a password
34. 34.🔍 Which is the odd one out? (a) a result on screen (b) sorting the scores (c) a beep sound (d) a pop-up message
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 130; // 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 1 (b) line 3 (c) line 2 (d) line 4
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 1 (b) line 4 (c) line 3 (d) line 2
37. 37.True or false: working out a tip is processing. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
40. 40.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) a pop-up message

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