getting the error code of LNK2001: unresolved external symbol when I run my program

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The error message "LNK2001: unresolved external symbol" in C++ typically occurs when there is a reference to a symbol (usually a function or variable) in your code that the linker is unable to find in any of the compiled object files or libraries.

Here's how you can troubleshoot and resolve this issue:

  1. Check for Typos or Mismatched Names:
    Ensure that the names of your functions or variables are spelled correctly and consistently. Even a small typo can cause this error.

  2. Missing Definitions:
    If you're referencing functions or variables that are defined in other source files, ensure that those files are correctly included in your project and compiled.

  3. Library or Object File Missing:
    If you're using external libraries or object files, make sure they are properly included in your project. Also, verify that you're linking against the correct version of the library.

  4. Namespace Issues:
    If you're using namespaces, ensure that the symbols you're referencing are defined within the correct namespace.

  5. Include Guards and Header Files:
    Make sure that header files have proper include guards (#ifndef, #define, #endif) to prevent multiple inclusion, which can cause symbol redefinition errors.

  6. Function Signatures:
    Check that the signatures (parameter types and return types) of the functions you're calling match their declarations or definitions.

  7. Templates and Inline Functions:
    For templates and inline functions defined in header files, ensure that they are implemented in the same header or included consistently.

  8. Compiler and Linker Settings:
    Verify that you're using the correct compiler and linker settings for your project. Sometimes, mismatched settings can lead to unresolved symbol errors.

  9. Check Project Dependencies:
    If your project depends on other projects or external libraries, ensure that those dependencies are properly configured.

  10. Rebuild All:
    Sometimes, issues arise due to outdated or inconsistent object files. Try cleaning your project and rebuilding it from scratch.

  11. Check Library Paths:
    If you're using external libraries, ensure that the library paths are correctly configured in your project settings.

  12. Verify Function Definitions:
    If you're defining functions in separate source files, ensure that the implementation matches the function declaration in the header file.

Carefully review your code and project settings to identify any inconsistencies or errors that might be causing the unresolved external symbol error.