Where should one put the header file so that visual studio automatically finds it when I open the project? I put in the same folder as source.cpp and it failed to find with #include invocation.
If you use <filename> it only looks in the directories on the search path -- this is intended for library and system headers (e.g. <iostream> <window.h>, etc.
If you use "filename" it will first look in the current project directory and only search along the path if it didn't find it in the project directory.
Andy
PS To see where Visual Studio looks open your project properties and look at the "VC++ Directories" under "Configuration Properties" (for Visual Studio 2010 on newer.)