C#程序执行所有基本算术运算

num1 + num2;

using System;
namespace Sample {
   class Demo {
      static void Main(string[] args) {
         int num1 = 50;
         int num2 = 25;
         int result;
         result = num1 + num2;
         Console.WriteLine("Value is {0}", result);
         result = num1 - num2;
         Console.WriteLine("Value is {0}", result);
         result = num1 * num2;
         Console.WriteLine("Value is {0}", result);
         result = num1 / num2;
         Console.WriteLine("Value is {0}", result);
         result = num1 % num2;
         Console.WriteLine("Value is {0}", result);
         result = num1++;
         Console.WriteLine("Value is {0}", result);
         result = num1--;
         Console.WriteLine("Value is {0}", result);
         Console.ReadLine();
      }
   }
}

Value is 75
Value is 25
Value is 1250
Value is 2
Value is 0
Value is 50
Value is 51