Unable to get invalid emails - c++

Question

I'm unable to get invalid emails to print in my code. I'm able to call the student roster just fine but that's about it.
#include <iostream>
#include <string>
#include "student.h"
#include "degree.h"
#include "roster.h"
using namespace std;
int main()
{
const string studentData[] =
{
"A1,John,Smith,John1989#gm ail.com,20,30,35,40,SECURITY",
"A2,Suzan,Erickson,Erickson_1990#gmailcom,19,50,30,40,NETWORK",
"A3,Jack,Napoli,The_lawyer99yahoo.com,19,20,40,33,SOFTWARE",
"A4,Erin,Black,Erin.black#comcast.net,22,50,58,40,SECURITY",
};
Roster* classRoster = new Roster(numberOfStudents);
for (int i = 0; i < numberOfStudents; ++i)
{
cout << studentData[i] << "," << endl;
}
cout << endl;
cout << "Invalid emails:";
for (int i = 0; i < numberOfStudents; ++i)
{
classRoster->printInvalidEmails();
}
cout << "Average days per class for each student" << endl;
for (int i = 0; i < numberOfStudents; ++i)
{
cout << endl;
}
cout << endl;
classRoster->printByDegreeProgram();
cout << endl;
system("pause");
return 0;
}
Here is my roster.cpp
#include <iostream>
#include <string>
#include "student.h"
#include "degree.h"
#include "roster.h"
using namespace std;
Roster::Roster()
{
This->rosterSize = 0;
this->lastIndex = -1;
this->classRosterArray = nullptr;
}
Roster::Roster(int rosterSize)
{
this->rosterSize = rosterSize;
this->lastIndex = -1;
this->classRosterArray = new Student * [rosterSize];
}
void Roster::add(string studentId, string firstName, string lastName,
string
emailAddress, int age,
int daysInCourse1, int daysInCourse2, int daysInCourse3, Degree degree)
{
}
void Roster::remove(string studentId)
{
for (int i = 0; i <= lastIndex; ++i)
{
if (classRosterArray[i] == nullptr)
{
cout << "ERROR: Student with ID: " << studentId << " not found" <<
endl;
break;
}
else if (studentId == classRosterArray[i]->getStudentId())
{
classRosterArray[i] = nullptr;
cout << "Student removed" << endl;
}
}
}
void Roster::printAll()
{
for (int i = 0; i <= this->lastIndex; ++i)
{
(this->classRosterArray)[i]->print();
}
}
void Roster::printAverageDaysInCourse(string studentId)
{
bool found = false;
for (int i = 0; i <= lastIndex; ++i) {
if ((*classRosterArray[i]).getStudentId() == studentId) {
found = true;
int average = 0;
average = (classRosterArray[i]->getNumberOfDaysToCompleteCourse()
[0]
+ classRosterArray[i]->getNumberOfDaysToCompleteCourse()[1] +
classRosterArray[i]->getNumberOfDaysToCompleteCourse()[2]) /
3;
cout << "Average days it took student " << studentId << " to
complete
a course: " << average
<< " days" << endl;
}
}
if (!found) cout << "Student not found." << endl;
}
void Roster::printInvalidEmails()
{
for (int i = 0; i < numberOfStudents; ++i)
{
string email = classRosterArray[i]->getEmailAddress();
bool isBad = false;
size_t at = email.find("#");
size_t period = email.find(".");
if (at == string::npos)
{
cout << "Invalid email. Missing # symbol." << endl;
}
else if (period == string::npos)
{
cout << "Invalid email. Missing a period." << endl;
}
else if (email.find(" ") != string::npos)
{
cout << "Invalid email. Spaces not allowed." << endl;
}
}
}
void Roster::printByDegreeProgram()
{
for (int i = 0; i < degreeType; ++i)
{
cout << &Roster::printByDegreeProgram;
}
}
Roster::~Roster()
{
for (int i = 0; i < numberOfStudents; ++i)
{
delete classRosterArray[i];
}
}
I'm just starting out and am not sure if i've totally messed myself up. Any help would be greatly appreciated. I thought might have been able to figure it out and i've tried a few different times but still unable to correct.