App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 190 · 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 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 3 (b) line 1 (c) line 2
2. 2.⚙️ What number does this app show?
   let bill = 108; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ What number does this app show?
   let km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.True or false: checking a password is an output. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) a beep sound (d) a pop-up message
7. 7.Which of these is an input? (a) checking a password (b) tapping a button (c) sorting the scores (d) adding up a bill
8. 8.Which of these is an input? (a) sorting the scores (b) typing your age (c) checking a password (d) a beep sound
9. 9.Which of these is an output? (a) a buzz (vibration) (b) sorting the scores (c) checking a password (d) taking a photo
10. 10.True or false: sorting the scores is processing. (a) True (b) False
11. 11.True or false: tapping a button is an input. (a) False (b) True
12. 12.Which of these is an output? (a) a pop-up message (b) adding up a bill (c) speaking a command (d) working out a tip
13. 13.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
14. 14.⚙️ What number does this app show?
    let bill = 60; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.Which of these is processing? (a) taking a photo (b) a beep sound (c) a pop-up message (d) sorting the scores
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 154; // 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 4 (b) line 1 (c) line 3 (d) line 2
17. 17.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 201; // 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
19. 19.⚙️ 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 3 (c) line 2
20. 20.True or false: tapping a button is processing. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) checking a password (d) working out a tip
22. 22.Which of these is an input? (a) working out a tip (b) a result on screen (c) speaking a command (d) checking a password
23. 23.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) sorting the scores
24. 24.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 2 (c) line 1 (d) line 4
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // 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
28. 28.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
29. 29.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
30. 30.True or false: typing your age is processing. (a) False (b) True
31. 31.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
32. 32.Which of these is processing? (a) adding up a bill (b) taking a photo (c) a result on screen (d) a buzz (vibration)
33. 33.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) working out a tip (d) sorting the scores
34. 34.⚙️ What number does this app show?
    let bill = 76; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 2 (c) line 1 (d) line 4
36. 36.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) a beep sound (d) a result on screen
37. 37.Which of these is an output? (a) a result on screen (b) working out a tip (c) sorting the scores (d) adding up a bill
38. 38.Which of these is processing? (a) checking a password (b) typing your age (c) tapping a button (d) a beep sound
39. 39.True or false: a beep sound is an input. (a) False (b) True
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 200; // 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 4 (b) line 1 (c) line 2 (d) line 3

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