App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 391 · 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.⚙️ 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);
2. 2.🔍 Which is the odd one out? (a) a beep sound (b) speaking a command (c) a buzz (vibration) (d) a pop-up message
3. 3.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) speaking a command (d) typing your age
4. 4.True or false: speaking a command is an input. (a) True (b) False
5. 5.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
6. 6.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) a beep sound (d) a result on screen
7. 7.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
8. 8.True or false: taking a photo is processing. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a pop-up message
10. 10.⚙️ What number does this app show?
    let bill = 66; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // 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 4 (c) line 1 (d) line 3
12. 12.Which of these is processing? (a) working out a tip (b) tapping a button (c) a pop-up message (d) a result on screen
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 3 (b) line 2 (c) line 4 (d) line 1
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
15. 15.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a pop-up message (d) working out a tip
16. 16.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) tapping a button (d) sorting the scores
17. 17.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.True or false: checking a password is an input. (a) True (b) False
20. 20.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 395; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 3 (c) line 2 (d) line 1
22. 22.Which of these is an output? (a) checking a password (b) sorting the scores (c) a buzz (vibration) (d) working out a tip
23. 23.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
24. 24.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.True or false: checking a password is processing. (a) True (b) False
26. 26.Which of these is an input? (a) a pop-up message (b) working out a tip (c) taking a photo (d) sorting the scores
27. 27.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
29. 29.Which of these is processing? (a) a result on screen (b) adding up a bill (c) taking a photo (d) a buzz (vibration)
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 510; // 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 1 (d) line 3
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 128; // 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 3 (b) line 4 (c) line 1 (d) line 2
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 310; // 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 4 (c) line 2 (d) line 3
33. 33.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) typing your age (d) speaking a command
34. 34.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
35. 35.⚙️ 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 1 (b) line 3 (c) line 2
36. 36.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
37. 37.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.Which of these is processing? (a) speaking a command (b) typing your age (c) sorting the scores (d) tapping a button
39. 39.True or false: a result on screen is an input. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) a beep sound (d) a pop-up message

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