C++ compilers include built-in functions to make programming
easier. The number and type of functions available to you depends upon
the compiler you are using. These functions that come with the compiler
are called "built-in" library functions.
Library functions are just like the functions that you, as
the programmer, create and are used in a similar manner. The only difference is that the source code
(definition) for library functions does NOT
appear in your program. The prototype for the library function is
provided to your program using the #include compiler directive.
There are dozens of libraries of functions available for your use.
will only be scratching the surface with our use of the most common library functions.
Libraries under discussion at this time: