How to declare a file in c++ ?

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C++

C++11

I have already created a file called ( student.txt) and i put the following information inside the file


Will Smith 99
Sarah Johnson 100
Tim Howard 70
Francesco Totti 95
Michael Jackson 92

I want to ask the user to enter the file name,once they enter the file name, I want to displays the average score by reading the data from the file.

Note : Each line in the file contains the first name, last name, and test score of a student.

Here's what i did so far and this could only display what inside the file
Please help me to declare the file name and to display the average score of a student

#include <iostream>
#include <string>
#include <fstream>

using namespace std;
int main() {
	string studentFile;

	ifstream file("student.txt");
	if (file.is_open()) {
		while (getline(file,studentFile))
		{
			cout << line << '\n';

		}
		file.close();

	}