public class Example
{
public static void ModifyWithRef(ref int x)
{
x += 10;
}

public static void ModifyWithOut(out int x)
{
x = 20;
}

public static void Main()
{
int a = 5;
ModifyWithRef(ref a);

int b = 5;
ModifyWithOut(out b);

Console.WriteLine($"Value of a: {a}");
Console.WriteLine($"Value of b: {b}");
}
}