Бесконечный цикл. Не могу понять почему.

The problem is that infinite looping is taking place and i can't figure out why this is  happening. It happens when I enter the choice as 1 and after entering Name, Role and Subject, it goes infinite. I've created a class "Professor" with data members as 3 vectors of type string and an "int count" along with three member functions as "Recruit", "DisplayInfo" and "Remove".  I'm basically trying to build a data of college professors.
I tried debugging the code. After first iteration it enters the loop and the switch and then directly to default case without me choosing the value for "choice"

<pre>
#include<iostream>
#include<string>
#include<vector>
#include<algorithm>

using namespace std;

class Professor
{
private:
    vector<string> Name;
    vector<string> Role;
    vector<string>Subject;
    static int count1;
public:
    void Recruit()
    {
        string name,role,subject;
        cout<<"Enter the Name: ";
        getline(cin, name);
        cin.ignore();
        Name.push_back(name);

        cout<<"Enter the Role: ";
        getline(cin, role);
        cin.ignore();
        Role.push_back(role);

        cout<<"Enter the Subject to be assigned: ";
        getline(cin, subject);
        cin.ignore();
        Subject.push_back(subject);
        count1++;
    }
    void DisplayInfo()
    {
        //cout<<"\nName   Role   Subject\n";
        for(int i=0; i<count1; i++)
        {
            cout<<"Name: "<<Name[i]<<"\n";
            cout<<"Role: "<<Role[i]<<"\n";
            cout<<"Subject: "<<Subject[i]<<"\n";   
        }
        cout<<"\n\n";
    }
    void Remove()
    {
        string name, role, subject;
        cout<<"Enter the name of the Professor, his/her Role and the subject assigned to him/her: ";
        cin>>name>>role>>subject;
        for(int i=0; i<count1; i++)
        {
            if(Name[i]==name && Role[i]==role && Subject[i]==subject)
            {
                vector<string>::iterator iter1 = find(Name.begin(), Name.end(), name);
                
                if(iter1 == Name.end())
                {
                    cout<<"";
                }
                else{
                    Name.erase(iter1);
                }
                vector<string>::iterator iter2 = find(Role.begin(), Role.end(), role);
                if(iter2 == Role.end())
                {
                    cout<<"";
                }
                else{
                    Role.erase(iter2);
                }
                vector<string>::iterator iter3 = find(Subject.begin(), Subject.end(), subject);
                if(iter3 == Role.end())
                {
                    cout<<"";
                }
                else{
                    Role.erase(iter3);
                }
            }
        }
    }
};

int main()
{
    Professor p;
    int choice;
    do{
        cout<<"You have the following Choices:\n";
        cout<<"1) Recruit a Professor\n";
        cout<<"2) Display the Information about Professors\n";
        cout<<"3) Remove a Professor\n";
        cout<<"4) Quit\n";
        cout<<"\n\nEnter the choice:";

        cin>>choice;

        switch(choice)
        {
            case 1:
            {
                p.Recruit();
                break; 
            }
            case 2:
            {
                p.DisplayInfo();
                break;
            }
            case 3:
            {
                p.Remove();
                break;
            }
            case 4:
            {
                break;
            }
            default:
            {
                cout<<"Sorry Wrong Choice!!\n";
                break;
            }
        }
    }while(choice!=4);
    return 0;
}