```csharp using system; interface igetmoney { double callfee(int minutes); } class acard : igetmoney { private const double initialfee =100; private const double feeperminute = 0.1; private const int freeminutes = 3; private double balance; public acard() { balance = initialfee; } public double callfee(int minutes) { double fee = 0; if (minutes <= freeminutes) { fee = 0; } else { fee = (minutes - freeminutes) * feeperminute; } balance -= fee; return fee; } public double getbalance() { re
turn balance; } } class Program { static void Main(string[] args) { acard mycard = new acard(); Console.WriteLine("Initial Balance: " + mycard.getbalance()); double fee = mycard.callfee(2); Console.WriteLine("Call Fee: " + fee); Console.WriteLine("Remaining Balance: " + mycard.getbalance()); fee = mycard.callfee(5); Console.WriteLine("Call Fee: " + fee); Console.WriteLine("Remaining Balance: " + mycard.getbalance()); } } ``` [2024-05-27 16:22:31 | AI写代码神器 | 291点数解答]
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