While循环

val++ 与++val 输出结果一样吗? 为什么?

class Program
    {
        static void Main(string[] args)
        {
            int sum=0,val=0;
            while(val<=10)
            {
                sum += val;
                ++val;
            }
            Console.WriteLine(sum.ToString());
        }
    }

class Program
    {
        static void Main(string[] args)
        {
            int sum=0,val=0;
            while(val<=10)
            {
                sum += val;
                val++;
            }
            Console.WriteLine(sum.ToString());
        }
    }

 

 

val=0 与val=1输出结果一样吗?为什么?

 

class Program
   {
       static void Main(string[] args)
       {
           int sum=0,val=0;
           while(val<=10)
           {
               sum += val;
               ++val;
           }
           Console.WriteLine(sum.ToString());
       }
   }

 class Program
{
static void Main(string[] args)
{
int sum=0,val=1;
while(val<=10)
{
sum += val;
++val;
}
Console.WriteLine(sum.ToString());
}
}