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Multiple #includes -- #pragma once

There's a problem sometimes where a .h file is #included into a file more than one time

resulting in compile errors. This can be a serious problem. Because of this, you want to

avoid #including .h files in other .h files if at all possible. On the other hand, #including

.h files in .c files is fine. If you are lucky, your compiler will support the #pragma once

feature which automatically prevents a single file from being #included more than once in

any one file. This largely solves multiple #include problems.

// foo.h

// The following line prevents problems in files which #include "foo.h"

#pragma once

<rest of foo.h ...>

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