App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 74 · 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 is the odd one out? (a) adding up a bill (b) checking a password (c) taking a photo (d) working out a tip
2. 2.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.True or false: working out a tip is processing. (a) True (b) False
4. 4.⚙️ What number does this app show?
   let price = 290; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) speaking a command (d) a beep sound
6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
7. 7.Which of these is an input? (a) checking a password (b) sorting the scores (c) a result on screen (d) speaking a command
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 10; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
9. 9.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) a buzz (vibration)
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 150; // typed by the user
    line 2: let off = 30; // 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
11. 11.Which of these is an output? (a) typing your age (b) a beep sound (c) working out a tip (d) sorting the scores
12. 12.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) sorting the scores (d) a beep sound
13. 13.True or false: tapping a button is processing. (a) True (b) False
14. 14.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
15. 15.🔍 Which is the odd one out? (a) tapping a button (b) sorting the scores (c) adding up a bill (d) checking a password
16. 16.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a pop-up message (d) speaking a command
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
18. 18.True or false: tapping a button is an output. (a) True (b) False
19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 3 (c) line 2 (d) line 1
21. 21.Which of these is processing? (a) a result on screen (b) checking a password (c) taking a photo (d) typing your age
22. 22.⚙️ What number does this app show?
    let bill = 142; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 1 (d) line 3
24. 24.True or false: a pop-up message is an output. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) a result on screen
26. 26.⚙️ What number does this app show?
    let bill = 244; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 380; // 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 2 (b) line 1 (c) line 4 (d) line 3
28. 28.⚙️ What number does this app show?
    let bill = 104; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.True or false: adding up a bill is an output. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) adding up a bill (d) checking a password
31. 31.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.True or false: speaking a command is an output. (a) True (b) False
33. 33.⚙️ 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 3 (b) line 2 (c) line 1
34. 34.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
35. 35.Which of these is an output? (a) checking a password (b) taking a photo (c) a buzz (vibration) (d) adding up a bill
36. 36.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.True or false: sorting the scores is processing. (a) True (b) False
39. 39.True or false: a buzz (vibration) is an output. (a) False (b) True
40. 40.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output

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