Programming in C Theory and Lab EST 102 for KTU 2019 Scheme- Dr Binu V P

header file is a file with extension .h which contains C function declarations and macro definitions to be shared between several source files.    There are two types of header files: the files that the programmer writes and the files that comes with your compiler.   You request to use a header file in your program by including it with the C preprocessing directive #include , like you have seen inclusion of stdio.h header file, which comes along with your compiler.   Including a header file is equal to copying the content of the header file but we do not do it because it will be error-prone and it is not a good idea to copy the content of a header file in the source files, especially if we have multiple source files in a program. A simple practice in C  is that we keep all the constants, macros, system wide global variables, and function prototypes in the header files and include that header file wherever it is required. Include Syntax Both the user and the system header