Microsoft Certified Solutions Developer (MCSD) Certification Practice Test

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What does the #line preprocessor directive control?

Compiler's line numbers
Function call conditions
Warnings and errors reporting
Logging levels

The correct answer is: Compiler's line numbers

The #line preprocessor directive is specifically designed to control the way the compiler interprets source code, particularly in terms of line numbering and the file name. When this directive is encountered, it can change the current line number reported by the compiler, allowing developers to specify a different filename or line number for readability and debugging purposes. This is particularly useful in scenarios involving generated code where you may want to maintain accurate line numbers in error messages and debugging information. For instance, if a special tool generates code and the developer wants to trace errors back to the source code, they might use the #line directive to set the line numbers and filenames to correlate with the original source. This makes it easier to understand where issues are occurring without confusion regarding the generated code. The other options relate to different aspects of programming and debugging but do not pertain to the specific function of the #line directive.