App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 928 · 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 an input? (a) a beep sound (b) adding up a bill (c) tapping a button (d) a buzz (vibration)
2. 2.True or false: sorting the scores is an output. (a) True (b) False
3. 3.⚙️ What number does this app show?
   let bill = 155; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.⚙️ What number does this app show?
   let price = 35; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 10; // typed by the user
   line 2: let qty = 2; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 1 (b) line 2 (c) line 4 (d) line 3
6. 6.⚙️ 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
7. 7.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) typing your age (d) tapping a button
8. 8.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
9. 9.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) checking a password (d) typing your age
10. 10.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
11. 11.Which of these is an output? (a) adding up a bill (b) taking a photo (c) tapping a button (d) a result on screen
12. 12.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
13. 13.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) a beep sound (d) speaking a command
14. 14.True or false: sorting the scores is processing. (a) False (b) True
15. 15.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.Which of these is processing? (a) sorting the scores (b) typing your age (c) taking a photo (d) a beep sound
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 92; // 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 3 (c) line 2 (d) line 1
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 580; // 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 1 (b) line 3 (c) line 2 (d) line 4
19. 19.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) a buzz (vibration)
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (b) line 1 (c) line 3 (d) line 4
21. 21.Which of these is an output? (a) sorting the scores (b) tapping a button (c) a buzz (vibration) (d) checking a password
22. 22.🔍 Which is the odd one out? (a) speaking a command (b) sorting the scores (c) adding up a bill (d) checking a password
23. 23.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
24. 24.Which of these is an input? (a) a beep sound (b) a result on screen (c) checking a password (d) taking a photo
25. 25.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 320; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 3 (c) line 1 (d) line 2
28. 28.True or false: taking a photo is processing. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) sorting the scores
30. 30.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) taking a photo
31. 31.True or false: a pop-up message is processing. (a) False (b) True
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // typed by the user
    line 2: let qty = 2; // 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
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // typed by the user
    line 2: let qty = 2; // 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
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 90; // 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 4 (b) line 3 (c) line 1 (d) line 2
35. 35.Which of these is an output? (a) a beep sound (b) typing your age (c) taking a photo (d) adding up a bill
36. 36.True or false: taking a photo is an input. (a) True (b) False
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 4 (d) line 1
38. 38.Which of these is processing? (a) a result on screen (b) working out a tip (c) typing your age (d) a buzz (vibration)
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 4 (b) line 2 (c) line 1 (d) line 3
40. 40.True or false: speaking a command is an input. (a) False (b) True

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