你可以使用以下C#代码来实现上述功能: ```csharp using System; interface IPhoneCard { void CalculateCost(int callMinutes); void CheckBalance(); } class ACard : IPhoneCard { private double balance = 100; public void CalculateCost(int callMinutes) { double cost = 0; if (callMinutes <= 3) { cost = callMinutes * 0.2; } else { cost = 0.6 + (callMinutes - 3) * 0.1; } Console.WriteLine("通话费用:{0}元", cost); balance -= cost; CheckBalance(); } public void CheckBalance() { Console.WriteLine("账户余额:{0}元", balance); } } class BCard : IPhoneCard { private double balance = 100; public void CalculateCost(int callMinutes) { double cost = callMinutes * 0.1; Console.WriteLine("通话费用:{0}元", cost); balance -= cost; CheckBalance(); } public void CheckBalance() { Console.WriteLine("账户余额:{0}元", balance); } } class Program { static void Main(string[] args) { Console.WriteLine("请输入卡的类型(A或B):"); string cardType = Console.ReadLine(); Console.WriteLine("请输入通话时间(分钟):"); int callMinutes = Convert.ToInt32(Console.ReadLine()); IPhoneCard phoneCard; if (cardType.ToLower() == "a") { phoneCard = new ACard(); phoneCard.CalculateCost(callMinutes); } else if (cardType.ToLower() == "b") { phoneCard = new BCard(); phoneCard.CalculateCost(callMinutes); } else { Console.WriteLine("输入错误!请重新运行程序输入正确的卡类型。"); } Console.ReadLine(); } } ``` 请根据上述代码进行测试。运行时,程序会提示用户输入卡的类型(A或B)和通话时间(分钟),然后会计算通话费用和账户余额。 [2024-05-27 14:23:29 | AI写代码神器 | 1292点数解答]