How to Fix 'Object Reference Required' Errors When Checking for Prime Numbers in C#?

Object reference error when evaluating prime numbers in C# program

The "Object reference is required for a non-static field, method, or property" error is usually caused by trying to access a non-static member in a static method. In this case, the error occurs in your C# program that evaluates whether a number and its inverse are prime.

Specifically, the error is related to your "volteado" and "siprimo" methods. To resolve this issue, declare these methods as static by adding the "static" keyword before declaring them. This way they can be accessed from the static "Main" method without creating an object instance.

The following is the corrected code:

static private bool siprimo(long a)
{
    // 判断接收到的数字是否为质数

    // ...

    return sp;
}

static private long volteado(long a)
{
    // 反转接收到的数字

    // ...

    return v;
}

By making these methods static, the need for object references is eliminated, which resolves the bug and allows the program to run as expected.

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