This should be simple...

Reitrahc (22)
When this runs, choosing any letter "m" or further acts like I had chosen "l" and I don't know why.

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void menu()
{
	char choice = 'z';
	while (choice == 'z')
	{
		cout << "MENU:\na.\tList all the courses\nb.\tList all the students\nc.\tAdd a new course to the course list\nd.\tRemove a course from the course list\ne.\tList information of a course\nf.\tRegister a new student to the student list\ng.\tRemove a student from the student list\nh.\tRegister a course for a student\ni.\tDrop a course for a student\nj.\tList information of a student\nk.\tList all of a student's courses\nl.\tList all students enrolled in a course\nm.\tQuit\n\n";
		cin >> choice;
		if (choice == 'a')
		{
			listCourses();
			choice = 'z';
		}
		else if (choice == 'b')
		{
			listStudents();
			choice = 'z';
		}
		else if (choice == 'c')
		{
			string id;
			CCourse add;
			cout << "Type the course ID, title and number of units.\n";
			cin >> id >> add.title >> add.units;
			add.setId(id);
			addCourse(add);
			choice = 'z';
		}
		else if (choice == 'd')
		{
			string id;
			cout << "Enter a course ID to remove a course.\n";
			cin >> id;
			if (checkCourse)
			{
				removeCourse(id);
			}
			choice = 'z';
		}
		else if (choice == 'e')
		{
			string id;
			int i = 0;
			cout << "Enter a course ID to see the information of a course.\n";
			cin >> id;
			while (i < 5 && Courses[i].getid() != id)
			{
				i++;
			}
			cout << Courses[i];
			choice = 'z';
		}
		else if (choice == 'f')
		{
			CStudent add;
			cout << "Enter student informaiton to add a student.\n";
			cin >> add;
			addStudent(add);
			choice = 'z';
		}
		else if (choice == 'g')
		{
			string id;
			cout << "Enter a student ID to delete a student.\n";
			cin >> id;
			if (checkStudent(id))
			{
				removeStudent(id);
			}
			choice = 'z';
		}
		else if (choice == 'h')
		{
			string Student, add;
			cout << "Enter the ID of a student to enroll in a course, and the ID of the course they are enrolling in.\n";
			cin >> Student >> add;
			if (checkStudent(Student))
			{
				if (checkCourse(add))
				{
					registerCourse(Student, add);
				}
			}
			choice = 'z';
		}
		else if (choice == 'i')
		{
			string Student, drop;
			cout << "Enter the ID of a student to drop from a course, and the ID of the course they are dropping.\n";
			cin >> Student >> drop;
			if (checkStudent(Student))
			{
				if (checkCourse(drop))
				{
					dropCourse(Student, drop);
				}
			}
			choice = 'z';
		}
		else if (choice == 'j')
		{
			string id;
			int i = 0;
			cout << "Enter a student ID to see the information of a student.\n";
			cin >> id;
			if (checkStudent(id))
			{
				while (i < 10 && Students[i].getId() != id)
				{
					i++;
				}
				cout << Students[i];
			}
			choice = 'z';
		}
		else if (choice == 'k')
		{
			string id;
			cout << "Enter a student ID to see all of their classes.\n";
			cin >> id;
			if (checkStudent(id))
			{
				listStudentCourses(id);
			}
			choice = 'z';
		}
		else if (choice = 'l')
		{
			string id;
			cout << "Enter a course ID to see all the students enrolled in that class.\n";
			cin >> id;
			if (checkStudent(id))
			{
				listStudentsInCourse(id);
			}
			choice = 'z';
		}
		else if (choice = 'm')
		{
			break;
		}
		else
			choice = 'z';
	}
}
Reitrahc (22)
Fixed it. Had = instead of ==.
Codermik (835)

Just some advice, a switch statement would be better suited for this rather than a lot of IF statements.

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switch (choice)
{
	case 'a':
		// do your stuff for a
	break;

	case 'b':
		// do your stuff for b
	break;

	case 'c':
		// do your stuff for c
	break;

		// .. and so on

};
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