C++输入流不等待输入提取运算符过载

Question

这个问题令我烦恼。而不是等待输入，它只是关闭。我一直试图弄清楚这一点。有任何想法吗？

istream& operator>>(istream& is, Account &a) { 
    cout << "Enter an accoutn number: "; 
     is >> a.accountNo; 
     cout << endl; 
    cout << "Balance: "; 
     is >> a.bal; 
    return is; 
    } 

Answer 1

当我把它改成下面的程序，它工作得很好（虽然它不会工作这么好，如果你想从什么，但std::cin读取帐户）：

#include <iostream> 

struct Account { 
    int accountNo; 
    int bal; 
}; 

using std::ostream; 
using std::istream; 
using std::cout; 
using std::endl; 

istream& operator>>(istream& is, Account &a) { 
    cout << "Enter an account number: "; 
    is >> a.accountNo; 
    cout << endl; 
    cout << "Balance: "; 
    is >> a.bal; 
    return is; 
} 

ostream &operator<<(ostream &os, Account const &a) { 
    return os << "Account #: " << a.accountNo << "\tBalance: " << a.bal; 
} 

int main() { 
    Account a; 
    std::cin >> a; 

    std::cout << a; 
    return 0; 
}