C#按输出传递参数

using System;

namespace CalculatorApplication {

   class NumberManipulator {

      public void getValue(out int x ) {
         int temp = 5;
         x = temp;
      }

      static void Main(string[] args) {
         NumberManipulator n = new NumberManipulator();

         /* local variable deFinition */
         int a = 100;

         Console.WriteLine(Before method call, value of a : {0}, a);

         /* calling a function to get the value */
         n.getValue(out a);

         Console.WriteLine(After method call, value of a : {0}, a);
         Console.ReadLine();

      }
   }
}