C Library Functions

Library functions are the inbuilt functions in C that are grouped and placed at a common place called the library. Such functions are used to perform some specific operations. For example, printf is a library function, used to print on the console. The library functions are created by the designers of compilers. All C standard library functions are defined inside the different header files saved with the extension.h . We need to include these header files in our program to make use of the library functions such as printf/scanf. We need to include stdio.h in our program which is a header file that contains all the library functions regarding standard input/output.