所以我的上一篇文章因为过于宽泛而被关闭了，所以我修了一些东西并缩小了范围。现在当我尝试运行它时，我在第136行得到错误，它是CheckingAccount类中的PrintAccount覆盖和第148行，它是AccountTest中的Main类。弹出的错误说：“mscorlib.dll中发生了'System.FormatException'类型的未处理异常附加信息：输入字符串的格式不正确。”我不知道如何解决它。任何指导将不胜感激。感谢。
namespace Assignment5
{
class Account
{
//variables
private double balance;
private string accountName;
private int accountNumber;
public Account(string acctName, int acctNum, double acctBal)
{
accountName = acctName;
accountNumber = acctNum;
balance = acctBal;
}
//gets and sets
public double Balance
{
get { return balance; }
set
{
if (value >= 0)
balance = value;
else
balance = 0;
}
}
public string AccountName
{
get { return accountName; }
}
public int AccountNumber
{
get { return accountNumber; }
}
//credit, debit and print methods
public void Credit(double a)
{
balance += a;
}
public void Debit(double a)
{
if (a > balance)
Console.WriteLine("Insufficient Funds.");
else
balance -= a;
}
public virtual void PrintAccount()
{
Console.WriteLine("Account Name :\t{0}\nAccount Number :\t{1)\nBalance :\t{2:C}",
accountName, accountNumber, balance);
}
class SavingsAccount : Account //this is how the derived class inherits from the base class, right?
{
public SavingsAccount(string acctName, int acctNum, double acctBal, double interest)
: base(acctName, acctNum, acctBal)
{
accountName = acctName;
accountNumber = acctNum;
balance = acctBal;
interestRate = interest;
}
private double interestRate;
public double InterestRate
{
get { return interestRate; }
set
{
if (value < 0)
interestRate = 0;
else
interestRate = value;
}
}
public void CalculateInterest()
{
balance = (balance * interestRate) + balance;
Console.WriteLine("Account Name:\t{0}\nAccount Number:\t{1}\nBalance:\t{2:C}\nInterest Rate:\t{3:P2}",
accountName, accountNumber, balance, interestRate);
}
public override void PrintAccount()
{
Console.WriteLine("Account Name :\t{0}\nAccount Number :\t{1)\nBalance :\t{2:C}\nInterest Rate :\t{3:P2}",
accountName, accountNumber, balance, interestRate);
}
}
class CheckingAccount : Account
{
public CheckingAccount(string acctName, int acctNum, double acctBal, double fee)
: base(acctName, acctNum, acctBal)
{
accountName = acctName;
accountNumber = acctNum;
balance = acctBal;
feeCharged = fee;
}
private double feeCharged;
public double FeeAmmount
{
set
{
if (value < 0)
feeCharged = 0;
else
feeCharged = value;
}
}
//No idea how to "invoke the Account class and use a boolean value to see if
//money was withdrawn."
//public void Credit(double a)
//{
// balance += a;
// balance -= feeCharged;
//}
//public void Debit(double a)
//{
// if (a > balance)
// Console.WriteLine("Insufficient Funds.");
// else
// balance -= a;
// balance -= feeCharged;
//}
public override void PrintAccount()
{
Console.WriteLine("Account Name :\t{0}\nAccount Number :\t{1)\nBalance :\t{2:C}\nFee Charged :\t{3:C}",
accountName, accountNumber, balance, feeCharged);
}
}
class AccountTest
{
static void Main(string[] args)
{
//Step 1 & 2
CheckingAccount lemmonsChecking = new CheckingAccount("Lemmons-Checking", 1, 1000, 3);
SavingsAccount lemmonsSavings = new SavingsAccount("Lemmons-Savings", 2, 2000, .05);
//Step 3 & 4
lemmonsChecking.PrintAccount();
lemmonsSavings.PrintAccount();
//Step 5 & 6
Console.WriteLine("\nDeposit $100 into checking.");
lemmonsChecking.Credit(100);
lemmonsChecking.PrintAccount();
//Step 7 & 8
Console.WriteLine("\nWithdraw $50 from checking.");
lemmonsChecking.Debit(50);
lemmonsChecking.PrintAccount();
//Step 9 & 10
Console.WriteLine("\nWithdraw $6000 from checking.");
lemmonsChecking.Debit(6000);
lemmonsChecking.PrintAccount();
//Step 11 & 12
Console.WriteLine("\nDeposit $3000 into savings.");
lemmonsSavings.Credit(3000);
lemmonsSavings.PrintAccount();
//Step 13 & 14
Console.WriteLine("\nWithdraw $200 from savings.");
lemmonsSavings.Debit(200);
lemmonsSavings.PrintAccount();
//Step 15 & 16
Console.WriteLine("\nCalculate interest on savings.");
lemmonsSavings.CalculateInterest();
//Step 17 & 18
Console.WriteLine("\nWithdraw $10,000 from savings.");
lemmonsSavings.Debit(10000);
lemmonsSavings.PrintAccount();
Console.WriteLine("\nPress the [ENTER] key to continue.");
Console.ReadLine();
//I keep receiving errors based around the override I placed on the PrintAccount()
}
}
}
}
答案 0 :(得分：3)
您有\t{1)而不是\t{1}
public override void PrintAccount()
{
Console.WriteLine("Account Name :\t{0}\nAccount Number :\t{1)\nBalance :\t{2:C}\nFee Charged :\t{3:C}", accountName, accountNumber, balance, feeCharged);
}
应该是
public override void PrintAccount()
{
Console.WriteLine("Account Name :\t{0}\nAccount Number :\t{1}\nBalance :\t{2:C}\nFee Charged :\t{3:C}", accountName, accountNumber, balance, feeCharged);
}