Accessing a Library Function:

A library function can be accessed simply by writing the function name, followed by the list of arguments that represent the information being passed to the function. The arguments must be enclosed in brackets and separated by commas. There may be no arguments in some cases.

For example:

                                    pow (v,p);

Thus in case, a library function pow is accessed which is included in the file math.h. It is a mathematical function which calculates v raised to power p.

Header Files:

While using various library functions we must include header file that contains various declaration describing the functions we use. It simply written as:

                        #include< header file name>

E.g.                  #include<stdio.h>

Where hash (#) tells the compiler that it is a preprocessor and #include acts like a preprocessor statement. It tells the compiler that the file enclosed in angle brackets (< >) is to be included at the time of inclusion in the program. 

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