Parsing logs v0.5

#include <iostream>
#include <fstream>
#include <string>
#include <stdlib.h>



using namespace std;

int main() {
string line;
float *t0 = NULL;
int tount = 0;
int k;

    ifstream logs_("C:/Users/Dmitry/Desktop/Zhuikov project/logGLO.txt");
    ofstream tout("outLOGTime.txt");
    ofstream pout("outLOGPot.txt");
    if (logs_.is_open())
    {
        while (!logs_.eof())
        {
           k = 0;
            logs_ >> line;

                /*if(line.substr(0,6) == "$GPGGA")
                {

                    if (t0)
                    {
                        tout << atof(line.substr(7,10).c_str()) - *t0 << endl;
                    }
                    else
                    {
                        t0 = new float;

                        *t0 = atof(line.substr(7,10).c_str());
                    }
                    tount++;
                }*/
                /*else*/ if (line.substr(0,6) == "$GPGSV")
                {
                    for(int N = 7; N <= 19; N+=4)
                    {

                        for (size_t i = 0; i < line.size(); i++)
                        if (line.at(i) == ',') k++;
                        if(k == N)

                        {
                            pout << atof(line.substr(0,2).c_str()) << endl;
                        }
                    }
                }

        logs_.close();
        tout << "K-vo Zna4eniy -- " << tount << endl;
        }
    }
    else
        cout<<"File is not open"<<'\n';
    tout.close();
    pout.close();

    return 0;
}