namespace CS8Tests;

public class RefReadonlySample
{
   public void Test()
   {
      var number = 5;
      Print(ref number);
      Console.WriteLine($"After Print -> Your number is {number}");
      
      // Output:
      // Print -> Your number is 5
      // After Print -> Your number is 6
   }
   
   private void Print(ref int number)
   {
      Console.WriteLine($"Print -> Your number is {number}");
      number++;
   }
}

 private void Print(in int number)

error CS8331: Cannot assign to variable 'number' or use it as the right hand side of a ref assignment because it is a readonly variable

private void Print(ref readonly int number)

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