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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);
                }
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原文地址:http://www.cnblogs.com/Mr-xue/p/4378952.html