App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 314 · 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 km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.True or false: taking a photo is processing. (a) True (b) False
3. 3.Which of these is an input? (a) checking a password (b) sorting the scores (c) speaking a command (d) adding up a bill
4. 4.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
5. 5.⚙️ What number does this app show?
   let bill = 68; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) tapping a button (d) taking a photo
7. 7.⚙️ What number does this app show?
   let km = 15; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) a buzz (vibration) (d) a pop-up message
9. 9.⚙️ What number does this app show?
   let bill = 96; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) sorting the scores (d) a pop-up message
11. 11.⚙️ What number does this app show?
    let bill = 33; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.True or false: speaking a command is an output. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) adding up a bill
14. 14.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 160; // 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 3 (d) line 1
16. 16.⚙️ What number does this app show?
    let bill = 34; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) working out a tip (d) tapping a button
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 2 (b) line 4 (c) line 3 (d) line 1
19. 19.True or false: speaking a command is an input. (a) True (b) False
20. 20.True or false: adding up a bill is processing. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.⚙️ What number does this app show?
    let bill = 105; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
24. 24.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.Which of these is processing? (a) a beep sound (b) checking a password (c) a pop-up message (d) speaking a command
26. 26.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
27. 27.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
28. 28.Which of these is processing? (a) tapping a button (b) adding up a bill (c) typing your age (d) taking a photo
29. 29.Which of these is an output? (a) sorting the scores (b) adding up a bill (c) a result on screen (d) taking a photo
30. 30.True or false: adding up a bill is an input. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) a buzz (vibration) (b) working out a tip (c) adding up a bill (d) sorting the scores
32. 32.True or false: working out a tip is processing. (a) True (b) False
33. 33.⚙️ 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 4 (b) line 3 (c) line 2 (d) line 1
34. 34.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
36. 36.True or false: tapping a button is processing. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.True or false: a result on screen is an input. (a) False (b) True
39. 39.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
40. 40.🔍 Which is the odd one out? (a) typing your age (b) working out a tip (c) tapping a button (d) speaking a command

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