What does the error "expected unqualified-id before '=' token" mean when trying to assign a function pointer to the address of another function?

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This error means that there is an issue with the syntax of your code. Specifically, it means that the compiler is expecting an identifier (a name that identifies a variable, function, or constant) but instead it found an equals sign (=). This often occurs when there is a problem with the way you are declaring or using a function pointer.

In this particular case, it suggests that you may not have declared the function pointer correctly, or that you are trying to assign a function pointer to a function that is not declared or defined yet. Check the syntax of your function pointer declaration and make sure that the function you are trying to assign it to has been declared or defined before you try to assign it.