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C# - #warning Preprocessor Directive Example
Here, we will use the #warning directive then the program will generate a warning with a specified message after the compilation of the program.
Submitted by Nidhi, on October 31, 2020 [Last updated : March 23, 2023]
Here, we will use the #warning directive then the program will generate a warning with a specified message after the compilation of the program.
C# program to demonstrate the example of #warning preprocessor directive
The source code to demonstrate the #warning preprocessor directive is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.
//C# program to demonstrate the
//#warning preprocessor directive.
#define MACRO1
#define MACRO2
#define MACRO3
#undef MACRO2
using System;
class Program
{
public static void Main()
{
#if (!MACRO2)
#warning MACRO2 is not defined
#endif
}
}
Output
Warning 1 #warning: 'MACRO2 is not defined'
Explanation
The above program will generate a warning because here we used the #warning directive with a specified message in the Main() method then the specified message will print as a warning when we compile the program.
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