#include <iostream>
#include <fstream>
using namespace std;

int main()
{

class LineCounter
{
public:
void print(char * name)
{
string line;
int counter = 0;
std::fstream myfile;
myfile.open (name, std::fstream::in);
if (myfile.is_open())
{
while ( getline (myfile,line) )
{
counter++;
std::cout << counter << " " << line << '\n';
}
myfile.close();
}
}

};

LineCounter fline;
fline.print("test.txt");
}