C#逻辑运算符

using System;

namespace OperatorsAppl {

   class Program {

      static voID Main(string[] args) {
         bool a = true; 
         bool b = true;

         if (a && b) {
            Console.Writeline("line 1 - Condition is true");
         }

         if (a || b) {
            Console.Writeline("line 2 - Condition is true");
         }

         /* lets change the value of  a and b */
         a = false;
         b = true;

         if (a && b) {
            Console.Writeline("line 3 - Condition is true");
         } else {
            Console.Writeline("line 3 - Condition is not true");
         }

         if (!(a && b)) {
            Console.Writeline("line 4 - Condition is true");
         }
         Console.Readline();
      }
   }
}