This code fails

Code:
#include <iostream.h>

int main ()
{
  cout << "Hello World!";
  return 0;
}
Errors are:

LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
Debug/fu.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

What am I doing wrongly?