// istream::get example
#include <iostream>     // std::cin, std::cout
#include <fstream>      // std::ifstream
 
int main () {
    std::string str;
    std::cout << "Enter the name of an existing text file: ";
    std::getline(std::cin, str);
    std::ifstream is(str);     // open file
    char c;
    while (is.get(c))          // loop while extraction from file is possible
      std::cout << c;
}