App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 427 · 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 processing? (a) sorting the scores (b) typing your age (c) a beep sound (d) taking a photo
2. 2.⚙️ 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);
3. 3.⚙️ What number does this app show?
   let price = 340; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) checking a password (d) typing your age
5. 5.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) tapping a button (d) a buzz (vibration)
6. 6.True or false: a beep sound is an output. (a) True (b) False
7. 7.⚙️ What number does this app show?
   let bill = 56; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 9; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
10. 10.True or false: taking a photo is an input. (a) False (b) True
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 1 (b) line 3 (c) line 2 (d) line 4
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
13. 13.Which of these is an output? (a) a pop-up message (b) checking a password (c) speaking a command (d) sorting the scores
14. 14.True or false: adding up a bill is an input. (a) False (b) True
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (c) line 3 (d) line 2
16. 16.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
17. 17.True or false: adding up a bill is processing. (a) True (b) False
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 3 (c) line 4 (d) line 2
19. 19.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
21. 21.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) a pop-up message (d) checking a password
23. 23.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
24. 24.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) a beep sound (d) a pop-up message
26. 26.True or false: a pop-up message is an output. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 248; // 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 1 (b) line 2 (c) line 4 (d) line 3
28. 28.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) adding up a bill (d) working out a tip
29. 29.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
30. 30.⚙️ 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 4 (c) line 1 (d) line 3
31. 31.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) typing your age (d) sorting the scores
32. 32.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
33. 33.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.Which of these is an input? (a) a result on screen (b) taking a photo (c) adding up a bill (d) checking a password
35. 35.Which of these is processing? (a) a beep sound (b) taking a photo (c) a buzz (vibration) (d) adding up a bill
36. 36.⚙️ What number does this app show?
    let bill = 248; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.Which of these is processing? (a) tapping a button (b) checking a password (c) a pop-up message (d) a buzz (vibration)
38. 38.Which of these is an input? (a) typing your age (b) working out a tip (c) a result on screen (d) a pop-up message
39. 39.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
40. 40.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) sorting the scores (d) typing your age

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