How to assign words from csv assign to variables?

I have a code that reads a file with a following: word1,word2,word,3....,word8 word1,word2,word,3....,word8 word1,word2,word,3....,word8

ifstream infile;
    //string path;s
    infile.open("file.csv");
    string line;
    CourseNode *current = head;
    int i=1;
    if(infile.is_open()){  
    while(getline(infile, line)) { 
        if(i == 1)
            cout << "1st line==> "+line << endl;  // ignore first line
        else {    // read data
        string firstname, lastname, id, a,b,c,d,t ;
        stringstream sst(line); 
        getline(getline (sst, firstname, ','),lastname, ',');
        //getline(getline(getline (sst, firstname, ','),lastname, ','),id, ','); 
        cout << "result==> "<< firstname<<" "<<lastname << endl;
    }  
    i++;
    }

I assume i have to work with this line and insert there my string variables but i am not sure how! getline(getline (sst, firstname, ','),lastname, ',');

Any help will be appreciateed! Thank you!