Visual c++.net

[tokra]

I just got my hands on visual c++.net 2002. I am aware that it ships without the optimising compiler but will someone explain why that release build of

#include <iostream.h>

int main()
{
	cout << &quot;Hello world&quot;;
	return 0;
}

compiles to 40k and the release build of

#include <iostream>
using namespace std;
int main()
{
	cout << &quot;Hello world&quot;;
	return 0;
}

compiles to 164k?
WR