❔ Pointer Issue.

unsafe class Test
{
    static void Main()
    {
        int a = 1; int b = 2;
        int* x = &a, y = &b;
        Console.WriteLine($"{*x} and {*y}");
        Swap(out x, out y);
        Console.WriteLine($"{*x} and {*y}");
    }

    static void Swap(out int* a, out int* b)
    {
        long x = (long)a;
        long y = (long)b;
        x ^= y ^= x ^= y;
        a = (int*)x; b = (int*)y;
    }
}

Error    CS0269    Use of unassigned out parameter 'a'    ConsoleApp1
Error    CS0269    Use of unassigned out parameter 'b'    ConsoleApp1