C++ while 循环以从输入文件中读取

我编写了一个函数，该函数使用 while 循环从输入文件中读取事务。不过，我一辈子都无法弄清楚为什么它会两次阅读最后 2 行。使用时

while(InFile){code}

据我了解，它将继续循环，直到文件到达 EOF 标记。我不知道我在这里哪里出错了。

void ProcessTransactions(Bank &acctList, string fileName)
{
Date transDate;
ifstream InFile;
InFile.open(fileName.c_str());
int month;
int day;
int year;
int acctNum;
int transAcctNum;
float amount;
string transType;
while(InFile)
{
InFile >> month >> day >> year;
transDate.SetDate(month, day, year);
InFile >> acctNum;
InFile >> amount;
InFile >> transType;
if(transType == "Transfer")
InFile >> transAcctNum;
cout << amount << endl;
}
}

输入文件

5 1 2012    1212    100.00  Deposit
5 1 2012    2323    100.00  Deposit
5 1 2012    3434    100.00  Deposit
6 1 2012    1212    200.00  Withdrawal
6 1 2012    2323    200.00  Withdrawal
6 1 2012    3434    50.00   Withdrawal
7 1 2012    1212    50.00   Transfer
2323
7 1 2012    2323    80.00   Transfer
3434
7 1 2012    3434    300.00  Transfer
1212
9 1 2012    1212    100.00  Deposit
9 1 2012    2323    100.00  Deposit
9 1 2012    3434    100.00  Deposit
10 1 2012   1212    300.00  Transfer
1212

输出

100
100
100
200
200
50
50
80
300
100
100
100
300
300 //** Why is this output twice ?

提取最后一位数据后，文件标记应已到达 EOF，从而终止循环。

任何帮助将不胜感激！

======================================================================================附加说明/解决方案 ： 从： 为什么循环条件中的 iostream：：eof 被认为是错误的？

因为iostream：：eof只有在读取流的末尾后才会返回true。它并不表示下一次读取将是流的结束。

考虑这一点(并假设下一次读取将在流的末尾)

while(!inStream.eof()){
int data;
// yay, not end of stream yet, now read ...
inStream >> data;
// oh crap, now we read the end and *only* now the eof bit will be 
set (as well as the fail bit)
// do stuff with (now uninitialized) data
}

对此：

int data;
while(inStream >> data){
// when we land here, we can be sure that the read was successful.
// if it wasn't, the returned stream from operator>> would be 
// converted to false
// and the loop wouldn't even be entered
// do stuff with correctly initialized data (hopefully)
}