Difference between writing #import and #import "filename.h" i.e written the file name in angular brackets and quotes?

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what is the difference between #include <filename> and #include “filename”

Difference between writing #import and #import "filename.h" i.e written the file name in angular brackets and quotes?

Answer 1

Quoted form This form instructs the preprocessor to look for include files in the same directory of the file that contains the #include statement, and then in the directories of any files that include (#include) that file. The preprocessor then searches along the path specified by the /I compiler option, then along paths specified by the INCLUDE environment variable.

Angle-bracket form This form instructs the preprocessor to search for include files first along the path specified by the /I compiler option, then, when compiling from the command line, along the path specified by the INCLUDE environment variable.

Source http://msdn.microsoft.com