namespace Test
{
 class Program
 {
  static void Main(string[] args)
  {
   int age;//聲明變量，類型為int，變量名為age
   age = 18;//給變量age賦值為18
   Console.WriteLine(“我今年”+age=“歲”);//打印age
   age = 19;//修改了變量age的值
   Console.WriteLine(“我明年”+age+“歲”);//打印age
  }
 }
}

static void Main(string[] args)
{
 int age;//年齡
 age = 18;
 age = 20;
 age = 20 + 1;
 Console.WriteLine(“我今年{0}歲”，age);
 age = age - 2;
}