newbie question about data I/O

From:

Seeker <zhongming@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Fri, 18 Sep 2009 14:32:34 -0700 (PDT)

Message-ID:

<af4c91a8-a601-47e3-b25a-3587cdd7f6f7@p9g2000vbl.googlegroups.com>

Howdy, gurus

I want to write code to read in a large genomic file. The data look
like

Marker location freq T mu sigma_2 S p-
value
rs2977670 713754 0.925 779 9.604 141.278 2.202 0.02763
rs2977656 719811 0.992 793 9.120 134.796 2.733 0.00627

Here is my code:

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

using namespace std;

int main(int argc, char** argv)
{
    vector<string> snp_list1,snp_list2,snp_list3;
    vector<int> location1,location2,location3;
    vector<double> freq1,freq2,freq3;
    vector<int> T1,T2,T3;
    vector<double> mu1,mu2,mu3;
    vector<double> sigma_21,sigma_22,sigma_23;
    vector<double> S1,S2,S3;
    vector<double> p1,p2,p3;

    //read in 1st data file;
    FILE *in=fopen(argv[1],"r");
    char line[128];
    fgets(line,128,in); //skip the 1st row;

while (fgets(line,128,in))
{

        cout << line << endl;

        char *str = strtok(line, "\t"); // the space in "\t" is a tab
        string marker(str);
        snp_list1.push_back(marker);

        str = strtok(NULL, "\t");
        location1.push_back(atof(str));

        str = strtok(NULL, "\t");
        freq1.push_back(atof(str));

        str = strtok(NULL, "\t");
        T1.push_back(atof(str));

        str = strtok(NULL, "\t");
        mu1.push_back(atof(str));

        str = strtok(NULL, "\t");
        sigma_21.push_back(atof(str));

        str = strtok(NULL, "\t");
        S1.push_back(atof(str));

        str = strtok(NULL, "\t");
        p1.push_back(atof(str));

    }
    fclose(in);

        //verify the vectors
    for (int i=0; i<snp_list1.size();++i)
        cout << snp_list1[i] << endl;
        return 0;
}

I tried to run the code but always met errors shown as "error while
dumping state..(core dumped)". I am new to C++.Thanks a lot for your
input.