Visual C# 2012 大学教程(第五版)Page318 11.8答案.docx

Page318 11.8（Account继承类型）using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace _318.练习11._8 class Program public class Account private decimal balance; public Account(decimal balance) this.balance = balance; public decimal Balance get return balance; set if (balance balance) Console.WriteLine(当前数额超出余额。); else balance -= push; public class SavingAccount : Account private double InterestRate; public SavingAccount(decimal balance, double interest) : base(balance) InterestRate = interest; public void Credit(decimal _pop) base.Credit(_pop); public void Debit(decimal _push) base.Debit(_push); public decimal CalculateInterest() return (decimal)InterestRate * Balance; public class CheckingAccount : Account private decimal TradeCost; public CheckingAccount(decimal balance, decimal TC) : base(balance) TradeCost = TC; public override void Credit(decimal pop) Balance=Balance+pop-TradeCost; public override void Debit(decimal push) if (push Balance) Console.WriteLine(当前数额超出余额。); else Balance -= push; Balance -= TradeCost; static void Main(string args) Account _1=new Account(9000); SavingAccount _2 = new SavingAccount(9000,0.04); CheckingAccount _3 = new CheckingAccount(9000, 0.01M); decimal interest = _2.CalculateInterest(); _2.Credi