What is the main purpose of a watch expression in programming?

The main purpose of a watch expression in programming is to track variable values during execution. Watch expressions are commonly used in debugging to monitor specific variables as the program runs. This allows developers to observe how the values of these variables change in response to the code that is executing, providing insights into the behavior of the program. By setting watch expressions, developers can identify issues such as unexpected value changes, logic errors, or data handling problems more effectively.

Utilizing watch expressions helps in diagnosing errors and ensuring that the code is functioning as intended, streamlining the debugging process and enhancing the overall quality of the software being developed.