App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 878 · 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.⚙️ What number does this app show?
   let price = 480; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
3. 3.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
4. 4.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) adding up a bill (d) speaking a command
5. 5.Which of these is processing? (a) working out a tip (b) a result on screen (c) typing your age (d) speaking a command
6. 6.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a pop-up message (d) tapping a button
7. 7.⚙️ What number does this app show?
   let bill = 55; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.Which of these is processing? (a) a beep sound (b) sorting the scores (c) typing your age (d) a buzz (vibration)
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // 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 1 (b) line 2 (c) line 3 (d) line 4
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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
12. 12.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) sorting the scores (d) working out a tip
13. 13.Which of these is processing? (a) speaking a command (b) taking a photo (c) a beep sound (d) checking a password
14. 14.Which of these is an input? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) checking a password
15. 15.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
17. 17.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
18. 18.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) checking a password (d) sorting the scores
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
20. 20.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 60; // 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 1 (b) line 2 (c) line 4 (d) line 3
22. 22.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
23. 23.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
24. 24.Which of these is an input? (a) a result on screen (b) taking a photo (c) a beep sound (d) working out a tip
25. 25.Which of these is an input? (a) checking a password (b) a beep sound (c) a pop-up message (d) speaking a command
26. 26.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) a buzz (vibration) (d) a result on screen
27. 27.True or false: typing your age is processing. (a) True (b) False
28. 28.True or false: working out a tip is an input. (a) True (b) False
29. 29.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
30. 30.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) typing your age (d) a result on screen
31. 31.Which of these is an input? (a) a buzz (vibration) (b) tapping a button (c) adding up a bill (d) a result on screen
32. 32.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
33. 33.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
34. 34.🔍 Which is the odd one out? (a) a beep sound (b) tapping a button (c) a buzz (vibration) (d) a pop-up message
35. 35.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
37. 37.True or false: adding up a bill is an output. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ 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 2 (b) line 1 (c) line 3
40. 40.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input

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