使用getline的问题

我正在为C 类简介的最终项目工作，并且我的代码有问题。Getline似乎无法正常工作，尽管我完全像其他时间一样键入它，并且在其他地方已经看到。这是有关代码的部分

    if (groceryMenu == 2)
        {
            string groceryItem;
            system("CLS");
            cout << "Enter what you would like to add to the grocery list: " << endl;
            getline(cin, groceryItem);
            groceryVector.push_back(groceryItem);

运行此操作时，COUT线在屏幕上显示(它只是闪烁，但是在您看到它停留后使用系统("暂停"((，但是随后它退出IF循环并返回主循环。我不知道我在这里做错了什么。任何帮助都将受到赞赏：(

如果有帮助，这是我的其余代码的其余部分。我知道这很粗糙；我刚开始。

// 7.3 lists and vectors
#include<iostream>
#include<iomanip>
#include<string>
#include<vector>
#include<fstream>
#include "stdafx.h"
using namespace std;

int main()
{
    int menuInput = 0;
    int exitProgram = 0;
    vector<string> groceryVector;
    vector<string> hardwareVector;
    vector<string> choreVector;
    fstream inputFile, outputFile;
    string groceryInput;
    inputFile.open("grocery.txt");
    while (getline(inputFile, groceryInput))
    {
        groceryVector.push_back(groceryInput);
    }
    inputFile.close();
    string hardwareInput;
    inputFile.open("hardware.txt");
    while (getline(inputFile, hardwareInput))
    {
        hardwareVector.push_back(hardwareInput);
    }
    inputFile.close();
    string choreInput;
    inputFile.open("chore.txt");
    while (getline(inputFile, choreInput))
    {
        choreVector.push_back(choreInput);
    }
    inputFile.close();
    while (exitProgram == 0)
    {
        system("CLS");
        cout << "List Manager" << endl;
        cout << "Press 1 to manage the grocery list." << endl;
        cout << "Press 2 to manage the hardware store list." << endl;
        cout << "Press 3 to manage the chore list." << endl;
        cout << "Press 4 to exit." << endl;
        cin >> menuInput;
        if (menuInput == 4)
        {
            system("CLS");
            cout << "Now exiting program." << endl;
            exitProgram = 2;
            break;
        }
        while (menuInput == 1)
        {
            system("CLS");
            int groceryMenu = 0;
            cout << "Press 1 to read the grocery list." << endl;
            cout << "Press 2 to add an item to the list." << endl;
            cout << "Press 3 to delete an item from the list." << endl;
            cout << "Press 4 to return to the main menu." << endl;
            cin >> groceryMenu;
            if (groceryMenu == 1)
            {
                system("CLS");
                for (string groceryList : groceryVector)
                {
                    cout << groceryList << endl;
                }
                system("PAUSE");
            }
            if (groceryMenu == 2)
            {
                string groceryItem;
                system("CLS");
                cout << "Enter what you would like to add to the grocery list: " << endl;
                getline(cin, groceryItem);
                groceryVector.push_back(groceryItem);
            }
            if (groceryMenu == 3)
            {
                int eraseLine = 0;
                system("CLS");
                cout << "What line would you like to erase from the list?" << endl;
                cin >> eraseLine;
                groceryVector.erase(groceryVector.begin() + (eraseLine - 1));
            }
            outputFile.open("grocery.txt");
            for (string groceryList : groceryVector)
            {
                outputFile << groceryList << endl;
            }
            outputFile.close();
            if (groceryMenu == 4)
            {
                menuInput = 0;
            }
        }
        while (menuInput == 2)
        {
            system("CLS");
            int hardwareMenu = 0;
            cout << "Press 1 to read the hardware list." << endl;
            cout << "Press 2 to add an item to the list." << endl;
            cout << "Press 3 to delete an item from the list." << endl;
            cout << "Press 4 to return to the main menu." << endl;
            cin >> hardwareMenu;
            if (hardwareMenu == 1)
            {
                system("CLS");
                for (string hardwareList : hardwareVector)
                {
                    cout << hardwareList << endl;
                }
                system("PAUSE");
            }
            if (hardwareMenu == 2)
            {
                string hardwareItem;
                system("CLS");
                cout << "Enter what you would like to add to the hardware list: " << endl;
                getline(cin, hardwareItem);
                hardwareVector.push_back(hardwareItem);
            }
            if (hardwareMenu == 3)
            {
                int eraseLine = 0;
                system("CLS");
                cout << "What line would you like to erase from the list?" << endl;
                cin >> eraseLine;
                hardwareVector.erase(hardwareVector.begin() + (eraseLine - 1));
            }
            outputFile.open("hardware.txt");
            for (string hardwareList : hardwareVector)
            {
                outputFile << hardwareList << endl;
            }
            outputFile.close();
            if (hardwareMenu == 4)
            {
                menuInput = 0;
            }
        }
        while (menuInput == 3)
        {
            system("CLS");
            int choreMenu = 0;
            cout << "Press 1 to read the chore list." << endl;
            cout << "Press 2 to add an item to the list." << endl;
            cout << "Press 3 to delete an item from the list." << endl;
            cout << "Press 4 to return to the main menu." << endl;
            cin >> choreMenu;
            if (choreMenu == 1)
            {
                system("CLS");
                for (string choreList : choreVector)
                {
                    cout << choreList << endl;
                }
                system("PAUSE");
            }
            if (choreMenu == 2)
            {
                string choreItem;
                system("CLS");
                cout << "Enter what you would like to add to the chore list: " << endl;
                getline(cin, choreItem);
                choreVector.push_back(choreItem);
            }
            if (choreMenu == 3)
            {
                int eraseLine = 0;
                system("CLS");
                cout << "What line would you like to erase from the list?" << endl;
                cin >> eraseLine;
                choreVector.erase(choreVector.begin() + (eraseLine - 1));
            }
            outputFile.open("chore.txt");
            for (string choreList : choreVector)
            {
                outputFile << choreList << endl;
            }
            outputFile.close();
            if (choreMenu == 4)
            {
                menuInput = 0;
            }
        }
    }
    return 0;
}