我应该怎么做才能退出被调用的函数并继续执行其他函数？

我已经使用元素testQuestion，answerQuestion和point创建了一个结构问题。我还创建了一个void函数，该函数连接到结构的元素。当我调用该函数并输入问题时，程序不会继续到其他元素即答案，而是转回输入用户名和密码。为什么会这样？

```
struct professor
{
    string username;
    string password;
};
professor professorData;

struct question
{
    char testQuestion[50];
    char answerQuestion[50];
    int pointQuestion;
};
question questionData;

void readProfessor(professor& professorData)
{
    cout<<"Enter the professor username: ";
    cin>>professorData.username;

    cout<<"Enter the professor password: ";
    cin>>professorData.password;
    cout<<endl;
}
void readQuestion(question& questionData)
{
    cout<<"Enter the question: "<<endl;
    cin>>questionData.testQuestion;

    cout<<"Enter the answers: "<<endl;
    cin>>questionData.answerQuestion;
}
void professorMenu()
{
    string pUsername;
    string pPassword;
    cout<<"Enter professor username: ";
    cin>>pUsername;
    cout<<"Enter professor password: ";
    cin>>pPassword;

    if((pUsername.compare(professorData.password)==0) && (pPassword.compare(professorData.password)==0))
    {
        readQuestion(questionData);
    }

}

calling from here

adminMenu()
{
    int adminUsername = 1234;
    int inputAdminUsername;
    char adminPassword[6] = "admin";
    char inputAdminPassword[6];
    int a;
    string inputStudent[20];
    string inputProfessor[20];

    cout<<"Enter admin username: ";
    cin>>inputAdminUsername;
    cout<<"Enter admin password: ";
    cin>>inputAdminPassword;

    if(inputAdminUsername == adminUsername && strcmp(adminPassword, inputAdminPassword) == 0)
    {
        cout<<"Successful login."<<endl;

    do 
    {       
        cout<<"Press 1 to add professor"<<endl;
        cout<<"Press 2 to add student"<<endl;
        cout<<"Press 3 to go back to main menu"<<endl;
        cin>>a;
        if(a==1)
        {
        readProfessor(professorData);
        }

        else if (a==2)
        {
        readStudent(studentData);
        }

        else if(a==3)
        mainMenu();
    } 
    while(a!=3);    
    }
    }