File INPUT

hey,
I am working on a program in which i have to ask the user for a file name and then check for errors and read data from that file. I'm not sure how to do this. if I cin the file name as a string how do i use it?

any help is appreciated.

Code:

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

...

std::string str;
std::cout << "Enter filename: ";   // Prompt for filename
std::cin >> str;                   // Get filename
std::ifstream input(str.c_str());  // Open file

thanks alot for the help