Where Does Visual Studio Search for C Header Files?

Locating C Header Files in Visual Studio

Problem:

While compiling a C application obtained from SourceForge, you encounter an error indicating a missing header file. Despite finding the file in the source code, you're unsure where it should be placed for the compiler to detect it. Are there specific directories where header files are expected?

Answer:

Visual Studio searches for header files in the following sequence:

1. Current Source Directory: The directory containing the C source file being compiled.
2. Additional Include Directories: Directories specified in the project's properties under "C/C " -> "General" -> "Additional Include Directories".
3. Visual Studio C Include Directories: Directories set in "Tools" -> "Options" -> "Projects and Solutions" -> "VC Directories" -> "Include Directories".
4. Default Include Directories (Visual Studio 2015 ): A predefined list of directories accessible through "Project Properties" -> "Configuration" -> "VC Directories" -> "Include Directories".

In this case, to resolve the missing header file issue, you can add the directory containing the header file to the project's "Additional Include Directories" in "Project Properties" -> "Configuration" -> "C/C " -> "General".

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