Ok I just bought Sams learn C++ In 21 days. So happy, since it got so many good reviews on C++ sites. Anyways!
I'm using the DEV-C++ compiler and ran into this. x_x;

C:\DOCUME~1\Slash\LOCALS~1\Temp\cc0Kcaaa.o(.text+0 x24):hello.cpp: undefined reference to `cout'
C:\DOCUME~1\Slash\LOCALS~1\Temp\cc0Kcaaa.o(.text+0 x29):hello.cpp: undefined reference to `ostream:perator<<(char const *)'

I get those errors while using these codes.

Code:
#include <iostream>

int main()
{
  std :: cout<< " Hello World!.\n";
  return 0;
  }