C# Program to Demonstrate the use of #define Preprocessor

This is a C# Program to demonstrate the working #define preprocessor.

This C# Program Demonstrates the Working #define Preprocessor.

Here the text defines the symbol B, then defines the symbol A, then undefines the symbol A. The program will compile with B being defined, and A being undefined.

Here is source code of the C# Program to Demonstrate the Working #define Preprocessor. The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

/*
 * C# Program to Demonstrate the Working #define Preprocessor
 */
#define B
#define A
#undef A
using System;
class Program
{
    static void Main()
    {
 
        #if A
            Console.WriteLine("'A' is Displayed Based on the undef Directive ");
        #elif B
            Console.WriteLine("'B' is Displayed Based on the undef Directive");
        #endif
        Console.ReadLine();
    }
}

This C# program is used to demonstrate the working #define preprocessor. Here text defines the symbol ‘B’, then defines the symbol ‘A’, and then undefined the symbol ‘A’. The program will compile with ‘B’ being defined, and ‘A’ being undefined.

 
'B' is Displayed Based on the undef Directive