Refactored to use better C++ style.

[Loki-Astari]

1: Reformatted.
2: Removed dead space on empty lines.
3: Use C++ Random number generator.
4: Use Raw String Literal for the title string.
5: Check for user input error.
6: Tidy up output strings (so readable).
7: Set up exit message (rather than checking an int).

[PallavRastogi]

Nice

[Loki-Astari]

Fixed the conflicts.