How do I fix linker errors in my C++ project?

How do I fix linker errors in my C++ project?

Linker errors usually occur when the compiler can't find the definitions for declared functions or variables. Can you share the specific error message you're seeing?

I'm getting an error that says 'undefined reference to function_name'.

This typically means that the function is declared but not defined. Make sure that the function is implemented in one of your source files and that the file is included in the build.

I have the implementation, but it's in a separate file. How do I include it?

You need to ensure that the file containing the implementation is compiled and linked with your project. If you're using a Makefile, add the source file to the list of objects to compile.

What if I'm using an IDE like Visual Studio?

In Visual Studio, you can add the source file to your project by right-clicking on the project in the Solution Explorer, selecting 'Add', and then 'Existing Item'. Make sure to rebuild the project afterward.