Parsing v0.5

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


using namespace std;




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

    ifstream logs_("C:/Users/Dmitry/Desktop/testlog.txt");
    ofstream tout("outLOGTime.txt");
    ofstream pout("outLOGPot.txt");
    if (logs_.is_open())
    {
        while(getline(logs_,line))
        {
            //line.find("RE004%on%")
            k = 0;

            if(line.substr(0,6) == "$GPGGA", "$GPGSV")

                dollar = line.find_first_of('$');
                star = line.find_first_of('*');
                for ( string::iterator c=dollar.begin(); c!=star.end(); ++c)
                    {
                    accumulate(c, 0, bit_xor<unsigned char>()) )
                    }


                if (line.substr(0,6) == "$GPGSV")
                {
                    for (size_t i = 0, N = 7; i < line.size(); i++)
                    {
                        if (line[i] == ',') k++;
                        if(k == N)
                        {
                        pout << line.substr(i+1, 2) << endl;
                        if ((N += 4) > 19) break;
                        }
                    }

                }

        logs_.close();

        }
    }
    else
        cout<<"File is not open"<<'\n';
    tout.close();
    pout.close();

    return 0;
}