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Header Files in C: The Key to Modular Programming and Code Reusability Introduction: Header files are a fundamental concept in the C programminglanguage , serving as a critical tool for achieving modular programming and code reusability. C is a powerful and widely-used programming language known for its simplicity and efficiency. One of the reasons for C's success and longevity is its support for modular programming , allowing developers to break down large programs into smaller, manageable modules or functions. Header files play a crucial role in this process by providing a way to declare function prototypes and share essential information across different parts of a C program . In this article, we will explore what header files are, how they work, and why they are essential for achieving modular programming and code reusability. 1. Understanding Header Files: In C programm...