App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 241 · 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 = 76; // 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) sorting the scores (b) adding up a bill (c) taking a photo (d) checking a password
3. 3.⚙️ What number does this app show?
   let price = 110; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 50; // 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 2 (b) line 3 (c) line 1 (d) line 4
5. 5.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
7. 7.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) a beep sound (d) a result on screen
8. 8.True or false: speaking a command is an input. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let bill = 380; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 4 (b) line 2 (c) line 3 (d) line 1
11. 11.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: tapping a button is an output. (a) False (b) True
13. 13.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
14. 14.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) a pop-up message (d) a buzz (vibration)
15. 15.Which of these is processing? (a) sorting the scores (b) a beep sound (c) tapping a button (d) a result on screen
16. 16.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.True or false: typing your age is an input. (a) False (b) True
18. 18.True or false: adding up a bill is an output. (a) True (b) False
19. 19.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.⚙️ 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);
21. 21.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
22. 22.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) typing your age (d) a result on screen
23. 23.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
24. 24.True or false: a buzz (vibration) is an output. (a) True (b) False
25. 25.True or false: a pop-up message is an output. (a) True (b) False
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 84; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 4 (c) line 3 (d) line 1
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 4 (b) line 2 (c) line 1 (d) line 3
28. 28.Which of these is an output? (a) speaking a command (b) typing your age (c) a result on screen (d) taking a photo
29. 29.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
30. 30.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 216; // 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 2 (b) line 1 (c) line 4 (d) line 3
32. 32.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) tapping a button (d) working out a tip
33. 33.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
34. 34.Which of these is an input? (a) a result on screen (b) tapping a button (c) adding up a bill (d) checking a password
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 180; // 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 2 (b) line 1 (c) line 4 (d) line 3
36. 36.Which of these is an input? (a) checking a password (b) taking a photo (c) working out a tip (d) adding up a bill
37. 37.True or false: checking a password is processing. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) sorting the scores (b) a result on screen (c) a pop-up message (d) a beep sound
39. 39.True or false: tapping a button is an input. (a) False (b) True
40. 40.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output

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