Dynamically changing array elements inside of structures

[wahhaj]

I'm learning pointers and references in class and I have run across what I believe to be a syntax problem which I don't understand. I have a structure with two character array and I need to be able to change the size of those array dynamically. But I have no idea how to do that. Take a look at my code and tell me what I am doing wrong.
I have to use character arrays and I think the dot notation. I am not sure if I can use arrow notation. I can not do this problem using strings and vectors.

#include <iostream>
#include <cstring>

using namespace std;

struct Student
{
	char* firstName;
	char* lastName;
	float gpa;
	
};

Student createStudentRecord()
{
	char FN[20], LN[20];
	float gpa;
	cout << "Enter first name";
	cin >>FN;
	cout << "\n Enter last name";
	cin >> LN;
	cout << "\n Enter GPA";
	cin >>gpa;
		
	int FNSize = strlen(FN);
	int LNSize = strlen(LN);

	Student* studentRecord = new Student;
	studentRecord.firstName = new char[FNSize];

}

[MiiNiPaa]

As student record is a ponter, you have to either dereference it first ((*studentRecord).firstName), or use pointer member selection: studentRecord->firstName

[wahhaj]

Do I have to put the 'char' before (*studentRecord).firstName like I did on the line above. I ask because in the line above I have to put the data type but elsewhere on the web I've seen this type of line work without the data type

[MiiNiPaa]

You need to put data type when you are declaring (creating) valuable. In all other cases you do not need it. You don't write std::istream cin >> char[20] LN, do you?

[wahhaj]

I got it, thanks for helping out