C# Program to Demonstrate the use of #define Preprocessor

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

Problem Description

This C# Program Demonstrates the Working #define Preprocessor.

Problem Solution

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.

Program/Source Code

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();
    }
}
Program Explanation

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.

advertisement
Runtime Test Cases
 
'B' is Displayed Based on the undef Directive

Sanfoundry Global Education & Learning Series – 1000 C# Programs.

If you wish to look at all C# Programming examples, go to 1000 C# Programs.

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
I’m Manish - Founder and CTO at Sanfoundry. I’ve been working in tech for over 25 years, with deep focus on Linux kernel, SAN technologies, Advanced C, Full Stack and Scalable website designs.

You can connect with me on LinkedIn, watch my Youtube Masterclasses, or join my Telegram tech discussions.

If you’re in your 40s–60s and exploring new directions in your career, I also offer mentoring. Learn more here.