The C programming language uses libraries as its primary method of extension. In C , a library is a set of functions contained within a single "archive " file . Each library typically has a header life , which contains the prototypes of the functions contained within the library that may be used by a program , and declarations of special data types and macro symbols used with these functions . The most common C library is the C standard library , which is specified by the ISO and ANSI C standards and comes functions with every C implementation. Another common set of C library functions are those used by applications specifically targeted for Unix like systems , especially functions which provide an interface to the kernel. Libraries are often written in C because C compilers generate efficient object code ; programmers then create interfaces to the li...
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