What is the difference between #include <filename> and #include "filename"?

The preprocessor is looking for a file to include in a different location.

#include "filename" looks for header files in the same directory as the source file. It is mainly used when include header files defined by the programmer.

#include<filename> depends on how it is implementedten thousand Typically, the compiler/IDE looks for header files in a pre-created directory. It is mainly used when include the standard libaray header file.