[SouravP]

Can you please give me an idea on library function definition in C programming language.Where the C - library functions are defined and declared?

[eash]

C library functions are the built-in functions that are accompanied along with the C compiler. they are defined and declared in their respective header files. they are the readily available functions which can be used directly without we writing a code for it. ex: printf() and scanf () are the formatted input and output functions which are declared and defined in the header file <stdio.h>
regards,
eash

[atul.sharma12]

The C standard library is a now-standardized collection of header files and library routines used to implement common operations, such as input/output and string handling, in the C programming language.

All the C library functions are declared in the different header files.