Car racing Game: Source code Step by Step - 1

I know that looking at plain code is not desirable, so just keep this code with you and wait for few days. The game, car racing, will be completed in few days. Just as i said, it is pain in the ass looking at the code that doesn't have an explanation but if you pay attention and need any help, i would gladly support you in any way.
I'm ready to explain every single line if you require. But first complete the game, and execute the game.
First thing is first.
So here code comes.

Car racing Game: Source code Step by Step - 0

I mentioned about developing car racing game earlier. So now i think i will supply the source code of it. Since it ain't small program, i'll make it several parts.
Here, i start with the main function, and next time i will add all necessary classes and its methods.
So, main function comes as follows

C#: System data types

C# Shorthand	System Type	Range	Meaning in life
sbyte	System.Sbyte	-128 to 127	Signed 8-bit number
byte	System.byte	0 to 255	Unsigned 8-bit number
short	System.Int16	-32.768 to 32.767	Signed 16-bit number
ushort	System.UInt16	0 to 65.535	Unsigned 16-bit number
int	System.Int32	-2.147.483.648 to 2.147.483.647	Signed 32-bit number
uint	System.UInt32	0 to 4,294,967,295	Unsigned 32-bit number
long	System.Int64	–9,223,372,036,854,775,808 to 9,223,372,036,854,775,807	Signed 64-bit number
ulong	System.UInt64	0 to 18,446,744,073,709,551,615	Unsigned 64-bit number
char	System.Char	U0000 to Uffff	A single 16-bit Unicode character
float	System.Single	1.5x10-45 to 3.4x1038	32-bit floating point number
double	System.Double	5.0x10-324 to 1.7x10308	64-bit floating point number
bool	System.Boolean	true or false	Represents truth or falsity
decimal	System.Decimal	100 to 1028	A 96-bit signed number
string	System.String	Limited by system memory	Represents a set of Unicode characters
object	System.Object	Any type can be stored in an object variable	The base class of all types in the .NET universe

PHP: Validating email address.

function emailValidate($email)
{
   if(!eregi("^[a-z]+[a-z0-9_-]*(\.[a-z0-9_-]+)*@[a-z0-9]+
      (\.[a-z0-9_-]+)*\.(\.[a-z]+){2,}$",$email))
  {
      return true;
  }
  return false;
}

eregi case insensitive regular expression math.

log2( x ): Binary Logarithm

In the math.h of Turbo C, binary logarithm ( log2( ) ) doesn't exists. When we are working with tree, we need to calculate depth of the tree, as well as the number of nodes in that depth.
The number of nodes in ith depth can be calculated using : 2ⁱ . formula
the max number of node in ith depth : n = 2ⁱ - 1 (complete tree).
You can use these formula to find the number of nodes in particular depth.

On the other hand, you may need to find the depth you are currently in.
There is a very easy way to do that. This is using binary logarithm to find the current depth.

...
#include <math.h>
double log2(double x)
{
       return log(x) / log(2);
}

If i made mistakes let me know
Good luck