#include <iostream>
int main()
{
    std::cout << "Hello, world!" << std:endl;
    return 0;
}

Compiling...
1>234.cpp
1>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(1) : warning C4627: '#include <iostream>': skipped when looking for precompiled header use
1>        Add directive to 'stdafx.h' or rebuild precompiled header
1>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(7) : fatal error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "stdafx.h"' to your source?
1>Build log was saved at "file://c:\Users\Rus\Documents\Visual Studio 2008\Projects\234\234\Debug\BuildLog.htm"
1>234 - 1 error(s), 1 warning(s)

 #include 'stdafx.h' int main() {     std::cout << "Hello, world!" << std:endl;     return 0; }

1>Compiling... 1>234.cpp 1>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(1) : error C2015: too many characters in constant 1>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(1) : error C2006: '#include' : expected a filename, found 'constant' 1>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(1) : fatal error C1083: Cannot open include file: '': No such file or directory 1>Build log was saved at "file://c:\Users\Rus\Documents\Visual Studio 2008\Projects\234\234\Debug\BuildLog.htm" 1>234 - 3 error(s), 0 warning(s)

#include <iostream>
#include 'stdafx.h'
int main()
{
    std::cout << "Hello, world!" << std:endl;
    return 0;
}

>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(1) : warning C4627: '#include <iostream>': skipped when looking for precompiled header use 1>        Add directive to 'stdafx.h' or rebuild precompiled header 1>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(2) : error C2015: too many characters in constant 1>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(2) : error C2006: '#include' : expected a filename, found 'constant' 1>c:\users\rus\documents\visual studio 2008\projects\234\234\234.cpp(2) : fatal error C1083: Cannot open include file: '': No such file or directory 1>Build log was saved at "file://c:\Users\Rus\Documents\Visual Studio 2008\Projects\234\234\Debug\BuildLog.htm" 1>234 - 3 error(s), 1 warning(s)