出租车计费

double a, b;
                Console.Write("请输入您的乘车距离:");
                a = Convert .ToDouble(Console.ReadLine());
                if (a>0&&a<=3)
                {
                    Console.WriteLine("8元");
                }
                else if (a>3&&a<=5)
                {
                    b = 8 + 1.2 * (a - 3);
                    Console.WriteLine(b);
                }
                else
                {
                     b = 8 +2.4+ 1.5 * (a - 5);
                     Console.WriteLine(b);
                }