App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 567 · 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.Which of these is processing? (a) tapping a button (b) a beep sound (c) typing your age (d) working out a tip
2. 2.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
3. 3.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 200; // typed by the user
   line 2: let off = 50; // 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
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 108; // 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 1 (d) line 3
6. 6.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a result on screen (d) typing your age
7. 7.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) checking a password (d) working out a tip
8. 8.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 1 (d) line 4
10. 10.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 4 (b) line 1 (c) line 2 (d) line 3
12. 12.Which of these is an output? (a) a buzz (vibration) (b) sorting the scores (c) tapping a button (d) speaking a command
13. 13.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 228; // 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 2 (d) line 3
15. 15.True or false: speaking a command is an input. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let bill = 186; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.⚙️ What number does this app show?
    let bill = 148; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.True or false: typing your age is an input. (a) True (b) False
19. 19.True or false: a pop-up message is processing. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) checking a password (d) sorting the scores
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // 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 3 (b) line 2 (c) line 1 (d) line 4
22. 22.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
23. 23.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) a pop-up message
24. 24.⚙️ 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);
25. 25.True or false: tapping a button is processing. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) taking a photo (d) adding up a bill
27. 27.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) checking a password (d) a beep sound
29. 29.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 36; // 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 3 (b) line 4 (c) line 2 (d) line 1
31. 31.Which of these is processing? (a) adding up a bill (b) a pop-up message (c) typing your age (d) a result on screen
32. 32.True or false: a beep sound is an output. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let bill = 245; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // typed by the user
    line 2: let off = 50; // 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
35. 35.Which of these is an output? (a) sorting the scores (b) checking a password (c) a pop-up message (d) working out a tip
36. 36.Which of these is processing? (a) taking a photo (b) tapping a button (c) checking a password (d) a result on screen
37. 37.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
38. 38.Which of these is an input? (a) a beep sound (b) speaking a command (c) checking a password (d) a buzz (vibration)
39. 39.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) adding up a bill
40. 40.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);

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