App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 881 · 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: tapping a button is an input. (a) False (b) True
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 15; // 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 2 (c) line 3 (d) line 4
3. 3.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
4. 4.True or false: working out a tip is processing. (a) False (b) True
5. 5.⚙️ What number does this app show?
   let price = 320; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.⚙️ What number does this app show?
   let price = 50; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 4; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
9. 9.⚙️ What number does this app show?
   let price = 440; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.True or false: a beep sound is an input. (a) False (b) True
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 90; // 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 3 (c) line 4 (d) line 1
12. 12.True or false: a pop-up message is an output. (a) True (b) False
13. 13.Which of these is processing? (a) taking a photo (b) a buzz (vibration) (c) adding up a bill (d) tapping a button
14. 14.⚙️ What number does this app show?
    let bill = 52; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 2 (b) line 3 (c) line 4 (d) line 1
17. 17.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) checking a password (d) sorting the scores
18. 18.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) a buzz (vibration)
19. 19.⚙️ 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);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 3 (b) line 4 (c) line 1 (d) line 2
21. 21.True or false: checking a password is an input. (a) True (b) False
22. 22.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
23. 23.Which of these is an output? (a) checking a password (b) typing your age (c) taking a photo (d) a buzz (vibration)
24. 24.True or false: adding up a bill is processing. (a) False (b) True
25. 25.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.Which of these is an output? (a) checking a password (b) a result on screen (c) tapping a button (d) typing your age
27. 27.⚙️ What number does this app show?
    let bill = 38; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) checking a password (d) tapping a button
29. 29.True or false: a beep sound is an output. (a) False (b) True
30. 30.Which of these is processing? (a) a beep sound (b) tapping a button (c) a result on screen (d) checking a password
31. 31.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
32. 32.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.Which of these is an input? (a) sorting the scores (b) speaking a command (c) working out a tip (d) a buzz (vibration)
34. 34.Which of these is an output? (a) tapping a button (b) a pop-up message (c) working out a tip (d) speaking a command
35. 35.⚙️ 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 3 (b) line 2 (c) line 1
36. 36.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) sorting the scores (d) checking a password
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
38. 38.Which of these is an input? (a) working out a tip (b) typing your age (c) a pop-up message (d) sorting the scores
39. 39.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
40. 40.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) sorting the scores (d) checking a password

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