---
title: "Discussion on \"Understanding Header Files and Source Files in C++\" | Hashnode"
description: "Discussion on \"Understanding Header Files and Source Files in C++\". Header Files (.h)\nHeader files are used to declare the interface of our code.\nSource Files (.cpp):\nIn C++, a source file contain implementations of functions/classes.\nPurpose of Header Files:\n\nDeclare, not define: Header files declare what functions,..."
url: "https://hashnode.com/posts/understanding-header-files-and-source-files-in-c/67952373d68ec7d17d053162"
---

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# [Understanding Header Files and Source Files in C++](https://cpp-blog.hashnode.dev/understanding-header-files-and-source-files-in-c?utm_source=hashnode&utm_medium=feed)

Header Files (.h) Header files are used to declare the interface of our code. Source Files (.cpp): In C++, a source file contain implementations of functions/classes. Purpose of Header Files: Declare, not define: Header files declare what functions,...

Jan 25, 2025 · 3 min read · cpp-blog.hashnode.dev  
Updated Feb 10, 2025  
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