Header Files contain definitions of functions and variables, which is imported or used into any C program by using pre-processor i.e, #include statement. Header files have an extension ".h" which contains C function declaration and macro definition.
For example, stdio.h is a header file contains declaration of input and output functions available in C. Similarly math.h contains declarations of mathematical functions available in C.
For example, stdio.h is a header file contains declaration of input and output functions available in C. Similarly math.h contains declarations of mathematical functions available in C.
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