Check out example codes for "how to read a comma delimited file into an array c++". It will help you in understanding the concepts better.

Code Example 1

#include <fstream>
#include <sstream>
#include <iostream>
#include <vector>

int main()
    std::ifstream inFile("registration.txt");
    if (inFile.is_open())
        std::string line;
        while( std::getline(inFile,line) )
            std::stringstream ss(line);

            std::string ID, fname, lname;
            std::getline(ss,ID,',');    std::cout<<"\""<<ID<<"\"";
            std::getline(ss,fname,','); std::cout<<", \""<<fname<<"\"";
            std::getline(ss,lname,','); std::cout<<", \""<<lname<<"\"";

            std::vector<std::string> enrolled;
            std::string course;
            while( std::getline(ss,course,',') )
                 enrolled.push_back(course); std::cout<<", \""<<course<<"\"";
    return 0;

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