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The standard libraries supplied by the C compilation system contain functions that you can use in your program to perform input/output, string handling, and other high-level operations that are not explicitly provided by the C language. Header files contain definitions and declarations that your program will need if it calls a library function. They also contain function-like macros that you can use in your program as you would a function.
``Link editing'' showed you how to link your program with these standard libraries and how to include a header file. This topic illustrates the use of header files and library functions in your program, and discusses the C++ precompiled header facility. It also describes the contents and location of some of the more important standard libraries, along with a brief discussion of standard I/O.