You have probably used both already, the one with the angle brackets for including headers that Apple provided. “path/header.h” with double quotes – these are meant for items that are limited in scope to your current project.
with angle brackets – these are meant for system or “global” includes.m file than you need the appropriate import for that. It is the linker then that resolves these references. In short: If you want to use something which is implemented outside the current. Header files do not actually contain executable code, but instead they tell the compiler which names and functions it should accept. Linker – this merges all the object files into one big binary while at the same time linking the symbols with the actual implementations.Each item that is not coming from the same. This step also replaces all instances of #defined values with what you defined them to be. Preprocessor – this takes care of including/importing header files into your source code, essentially pasting the content of the specified file right into your source code for building.The build process consists of these three steps: All these are generally called “symbols”. A header file generally informs the compiler what c-functions, global variables, Object-C methods and classes exist in an object file.
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