The same problem can occur if you include file1.h in file2.h and inlcude both file1.h and file2.h in another file like file3.h. If you include a file multiple times in one file, it can cause compilation errors.įor instance, if you declare a class in a file and include it twice, your code won’t compile since you can’t declare the same class several times. While it might seem that a bug is coming from faulty code, in some cases it can be the result of incorrect or circular preprocessing. If you do use this, #include "file" will still only check the additional folder after it checks the local directory as explained above. Note that include_path must be the absolute path of the folder, meaning it starts from your computer’s root directory, /. If you use the compile argument -Iinclude_path with g++, you can specify additional folders for both #include "file" and #include to search for file However, you should not use #include "file" for library files to make your code more understandable. If the file you are trying to include does not exist in your local folder the preprocessor then treats your #include "file" line like a #include line, searching the C++ library files. /home/cs104/hw-student/hw1/extra/file2.h would require #include "extra/file2.h"./home/cs104/hw-student/hw2/file2.h would require #include "./hw2/file2.h"./home/cs104/hw-student/file2.h would require #include "./file2.h".However, if file2.h had a different path and was not adjacent to file1.cpp, you might do something different: If the file is inside quotations, it’s first searched for from wherever the #include is, i.e. If you want to include file2.h, all you would do is add #include "file2.h".
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