Introduction to the concept of linking in the compilation process.

• Linking is the step after compiling source code files, resulting in an executable binary.
• Linking connects symbols and functions from multiple object files into one cohesive program.
• Even a single file program requires linking to identify the entry point, such as the main function.

Differentiation between compiling and linking stages using Visual Studio.

• Compilation and linking are two distinct stages that can be separately triggered in Visual Studio.
• Compilation errors and linking errors produce different error messages and codes.
• Compiling is successful if syntax is correct, while linking requires correct definitions and entry points.

Exploration of common linking errors and their resolution.

• Linking errors occur when the linker cannot resolve symbols or when multiple definitions of a symbol are found.
• Resolving errors involves ensuring the correct declaration of functions and entry points across files.
• Examples include adding missing main functions, resolving duplicate symbols, and correcting function declarations.

Demonstration of a working application and the impact of splitting code across files.

• A sample code with functions 'log' and 'multiply' is shown to work as a single file application.
• Splitting the log function into a separate file illustrates the need for correct function declarations for linking.

Investigation of the 'unresolved external symbol' linking error and its fix.

• The error arises when the linker cannot find a symbol it needs to link, such as a function call.
• The video shows how to resolve the error by ensuring that the function definition matches the declaration across files.

Discussion of the 'multiply defined symbols' linking error and methods to avoid it.

• This error occurs when identical symbols are defined in multiple object files.
• The video demonstrates resolving this error by using static or inline specifications, or by consolidating definitions into one translation unit.

Summary of linking concepts and a reminder of the importance of understanding error types.

• Linking is essential for combining object files and libraries into a final executable.
• Different types of linking include static and dynamic, which will be discussed in a future video.
• Understanding compiling versus linking errors is crucial for effective debugging.