C# Program to Demonstrate the Working #define Preprocessor

Code:

#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();
    }
}


Output:

'B' is Displayed Based on the undef Directive

More C# Programs: