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What is the use of header files in C language?

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My teaching experience 12 years

declare functions, variables, and other identifiers that are used in a program.
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help organize code by separating the implementation (in source files) from the declarations (in header files).
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"Rajesh Kumar N: Guiding Young Minds from 1 to 12 with Expertise and Care"

Header files declare functions, macros, and constants, allowing code reuse and modularity (e.g., #include ).
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