Why Am I Getting 'Error: LNK2019 unresolved external symbol _main' in My C Program?

Error: Resolving Unresolved External Symbols

Problem Description:

Encountering "Error: LNK2019 unresolved external symbol _main" when linking a C program.

Root Cause and Analysis:

This error occurs when the linker cannot find the entry point function "_main", which is the starting point of a C program.

Solution:

Check the following in project properties:

1. Linker->System->SubSystem: Ensure it is set to "Windows" rather than "Console".

Additional Considerations:

Check other possible reasons for the error:

• Ensure that "_main" is properly defined in the code.
• Verify that the appropriate header files are included.
• Check if there are multiple definitions of "_main" in different source files.
• Ensure that the linker command line includes the correct object files and libraries.

By resolving these issues, you can ensure that the program entry point is defined and the correct libraries are linked, resolving the "unresolved external symbol" error.

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