App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 393 · 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 checking a password an input, processing or an output? (a) input (b) processing (c) output
2. 2.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
3. 3.True or false: speaking a command is an output. (a) True (b) False
4. 4.Which of these is an output? (a) taking a photo (b) typing your age (c) a result on screen (d) checking a password
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 480; // 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 3 (b) line 2 (c) line 4 (d) line 1
6. 6.⚙️ What number does this app show?
   let km = 11; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
8. 8.⚙️ What number does this app show?
   let km = 2; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) sorting the scores (d) checking a password
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // 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 1 (c) line 4 (d) line 3
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 228; // 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 2 (c) line 4 (d) line 1
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 150; // 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 3 (b) line 1 (c) line 2 (d) line 4
14. 14.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.True or false: tapping a button is an input. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) a beep sound (d) a pop-up message
17. 17.Which of these is processing? (a) a pop-up message (b) working out a tip (c) a result on screen (d) speaking a command
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 26; // 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 3 (b) line 2 (c) line 4 (d) line 1
19. 19.True or false: working out a tip is an input. (a) False (b) True
20. 20.True or false: a result on screen is an output. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) typing your age (d) adding up a bill
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 4 (c) line 2 (d) line 3
23. 23.True or false: typing your age is an input. (a) True (b) False
24. 24.Which of these is an input? (a) a beep sound (b) a result on screen (c) working out a tip (d) speaking a command
25. 25.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 2 (b) line 1 (c) line 3 (d) line 4
27. 27.Which of these is an input? (a) a buzz (vibration) (b) tapping a button (c) a pop-up message (d) checking a password
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 2 (b) line 4 (c) line 1 (d) line 3
29. 29.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.True or false: checking a password is an input. (a) True (b) False
32. 32.⚙️ What number does this app show?
    let bill = 165; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) working out a tip (d) typing your age
34. 34.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) tapping a button
35. 35.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) sorting the scores (d) tapping a button
36. 36.Which of these is an output? (a) a pop-up message (b) taking a photo (c) speaking a command (d) tapping a button
37. 37.True or false: tapping a button is processing. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let bill = 212; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.True or false: adding up a bill is an input. (a) False (b) True
40. 40.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);

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