为什么我的矢量删除数据

我正在写一个基本的债务计算器来练习我的C ，但我的一个向量一直在删除其值。

包含向量的结构：

struct debt 
{
std::string institution, debtType;
double creditLimit, balance, intrest, debtRatio, minMonthly;
int monthsToPayOff;
std::vector <double> monthlyBalance; //this vector is giving me trouble
};

我调用一个函数，该功能每月存储每月余额减去矢量中的每月付款。

for (auto i : vectDebt) 
{
    double tempBalance = i.balance;
    while (tempBalance > 0) 
    {
        i.monthlyBalance.push_back(tempBalance); //this seems to work fine
        tempBalance -= i.minMonthly;
    }
    if (i.monthlyBalance.size() > vectMonths.size())
        vectMonths.resize(i.monthlyBalance.size());
}

Visual Studio调试器显示，这些值已正确存储在上述代码中。然后，我尝试将值打印到.csv文件，但到那时，向量已经空了。

//print the payoff balances in debt.csv
for (auto i: vectDebt) 
{
    for (int j = 0; j != i.monthlyBalance.size(); j++) 
    {
        fileout << i.monthlyBalance[j] << ","; //the debugger shows monthlyBalance has size = 0
    }
    fileout << "n";
}

这是我的完整代码，有关改进程序的任何其他评论也将被应用：

债务

#pragma warning(disable : 4996) //diable localtime warning
#ifndef DEBT_H
#define DEBT_H
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <time.h>
#include <vector>
struct debt 
{
std::string institution, debtType;
double creditLimit, balance, intrest, debtRatio, minMonthly;
int monthsToPayOff;
std::vector <double> monthlyBalance;
};
class Debt 
{
  private:
time_t t = time(NULL);
tm *timeinfo = localtime(&t);
const std::string months[12] = { "January","February","March","April","May","June","July",
    "August","September","October","November","December" };
std::ofstream fileout;
std::vector <debt> vectDebt;
std::vector <std::string> vectMonths;
public:
Debt() {    }
void addDebt(debt temp) 
{
    vectDebt.push_back(temp);
}
std::string returnMonth(int month) 
{
    std::string currentMonth = months[month - 1];
    return currentMonth;
}
void calcPayoff();
void printDebt();
void printPayoff();
~Debt() {   }
};
#endif //DEBT_H

债务.cpp

#include "Debt.h"
void Debt::calcPayoff()
{
for (auto i : vectDebt) 
{
    double tempBalance = i.balance;
    while (tempBalance > 0) 
    {
        i.monthlyBalance.push_back(tempBalance);
        tempBalance -= i.minMonthly;
    }
    if (i.monthlyBalance.size() > vectMonths.size())
        vectMonths.resize(i.monthlyBalance.size());
}
}
void Debt::printDebt()
{
fileout.open("debt.csv");
fileout << "Institution(type),Current Balance,Intrest,Min Monthly Payment,Credit Limitn";
for (auto i : vectDebt) 
{
    fileout << std::fixed << std::setprecision(2) << i.institution << "("
        << i.debtType << "),"
        << i.balance << ","
        << i.intrest << ","
        << i.minMonthly << ","
        << i.creditLimit << "n";
}
printPayoff();
fileout.close();
}
void Debt::printPayoff()
{
int monthCounter = timeinfo->tm_mon;
fileout << "nBalance per Month until paid off:n";
for (int i = 0; i != vectMonths.size(); i++) 
{
    vectMonths.at(i) = months[monthCounter % 12];
    monthCounter++;
}
for (auto i : vectMonths)
    fileout << i << ",";
fileout << "n";
//print the payoff balances in debt.csv
for (auto i: vectDebt) 
{
    for (int j = 0; j != i.monthlyBalance.size(); j++) 
    {
        fileout << i.monthlyBalance[j] << ",";
    }
    fileout << "n";
}
 }

源文件：

#include "Debt.h"
void main() {
Debt newList;
int check = 1;
std::string institution = "",
    debtType = "";
double balance = 0,
    intrest = 0,
    creditLimit = 0,
    minMonthly = 0;
std::cout << "This program will ask you to enter each of your debts institution(bank name), "
        << "debt type(loan, credit, car), current balance, interest rate, credit limit, and minimum monthly payment.n";
while (check == 1) {
    debt temp;
    if (check == 1) {
        std::cout << "Enter name of institution: ";
        std::cin >> temp.institution;
        std::cout << "Enter debt type (loan, credit, car...): ";
        std::cin >> temp.debtType;
        std::cout << "Enter current balance: ";
        std::cin >> temp.balance;
        std::cout << "Enter inrest rate for this debt: ";
        std::cin >> temp.intrest;
        std::cout << "Enter credit limit for this debt: ";
        std::cin >> temp.creditLimit;
        std::cout << "Enter the minimum monthly payment for this debt: ";
        std::cin >> temp.minMonthly;
        temp.debtRatio = 100*(temp.balance/temp.creditLimit);
        newList.addDebt(temp);
        std::cout << "Add another debt? n"
            << "1) Yesn"
            << "2) Non";
        std::cin >> check;
    }
}
newList.calcPayoff();
newList.printDebt();

}