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
```
```
{
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```
    static void Main()
```
```
    {
```
```
 
```
```
        #if A
```

            Console.WriteLine("'A' is Displayed Based on the undef Directive ");

```
        #elif B
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            Console.WriteLine("'B' is Displayed Based on the undef Directive");

```
        #endif
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

Here is the output of the C# Program:

'B' is Displayed Based on the undef Directive

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