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C# program to demonstrate the #error preprocessor directive
Here, we are going to demonstrate the #error preprocessor directive in C#?
Submitted by Nidhi, on October 31, 2020
Here, we will use the #error directive then the program will generate a syntax error.
Program:
The source code to demonstrate the #error preprocessor directive is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.
//C# program to demonstrate the
//#error preprocessor directive.
#define MACRO1
#define MACRO2
#define MACRO3
#undef MACRO2
using System;
class Program
{
public static void Main()
{
#if (!MACRO2)
#error MACRO2 is not defined
#endif
}
}
Output:
Error 1 #error: 'MACRO2 is not defined'
Explanation:
The above program will generate a syntax error because here we used the #error directive with an error message in the Main() method then the specified message will print as a syntax error when we compile the program.
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