问题
Possible Duplicate:
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?
回答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
来源：https://stackoverflow.com/questions/3156432/difference-between-writing-import-filename-h-and-import-filename-h-i-e-wri