How to Fix the 'Object Reference Required' Error in a C# Prime Number Program?

Troubleshooting the "Object Reference Required" Error in a C# Prime Number Program

The common "an object reference is required for the non-static field, method, or property" error in C# often occurs when a static method tries to access non-static members (methods or properties). This issue is present in the supplied C# prime number checker.

The Main method, essential in .NET applications, is correctly declared as static. However, the siprimo and volteado methods are not. This incompatibility causes the error.

The solution is straightforward: declare siprimo and volteado as static methods. Add the static keyword to their declarations:

<code class="language-csharp">static private bool siprimo(long a)
static private long volteado(long a)</code>

This simple modification will resolve the compilation error, enabling the program to successfully check if a number and its reverse are both prime numbers.

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