C#if...elseif...else语句

using System;

namespace DecisionMaking {

   class Program {

      static void Main(string[] args) {
         /* local variable definition */
         int a = 100;

         /* check the boolean condition */
         if (a == 10) {
            /* if condition is true then print the following */
            Console.WriteLine("Value of a is 10");
         } else if (a == 20) {
            /* if else if condition is true */
            Console.WriteLine("Value of a is 20");
         } else if (a == 30) {
            /* if else if condition is true  */
            Console.WriteLine("Value of a is 30");
         } else {
            /* if none of the conditions is true */
            Console.WriteLine("None of the values is matching");
         }
         Console.WriteLine("Exact value of a is: {0}", a);
         Console.ReadLine();
      }
   }
}

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