Create a vector of strings from file c++ - c++

Question

I am trying to input three pieces of information from a .txt file.
First column is the course mark.
Second column is the course code.
Third column(s) is the course name.
I would like to store these as 3 vectors of strings.
Would using stringstream be a good option here? and maybe iterators?
The .txt file is like
65.6 10071 Mathematics 1
66.7 10101 Dynamics
60.0 10121 Quantum Physics and Relativity
66.9 10191 Introduction to Astrophysics and Cosmology
... ... ...
and my code so far is
#include<iostream>
#include<iomanip>
#include<fstream>
#include<cmath>
#include<algorithm>
#include<string>
#include<iterator>
#include<sstream>
#include<vector>
//Main Function
int main()
{
//Define variables
std::string course_mark, course_code, course_name;
std::vector<std::string> course_mark_vector;
std::vector<std::string> course_code_vector;
std::vector<std::string> course_name_vector;
std::string data_file[100];
// Ask user to enter filename
std::cout<<"Enter data filename: ";
std::cin>>data_file;
int i{0};
// Open file and check if successful
std::fstream course_stream(data_file);
if(course_stream.is_open()) {
while (!course_stream.eof()) //while the end of file is NOT reached
{
//I have 2
getline(course_stream, course_mark, ' ');
course_mark_vector.push_back(course_mark);
getline(course_stream, course_code, ' ');
course_code_vector.push_back(course_code);
getline(course_stream, course_name, '\n');
course_name_vector.push_back(course_name);
i += 1; //increment number of lines
}
course_stream.close(); //closing the file
std::cout << "Number of entries: " << i-1 << std::endl;
}
else{
std::cout << "Unable to open file. Please run again" << std::endl;
return 1;
}
Any help would be greatly appreciated

Answer 1

Would using stringstream be a good option here?
Yes.
and maybe iterators?
There is no need for iterators in this case.
Try this:
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include <iomanip>
//Main Function
int main()
{
//Define variables
std::string course_mark, course_code, course_name, data_file, line;
std::vector<std::string> course_mark_vector, course_code_vector, course_name_vector;
int i = 0;
// Ask user to enter filename
std::cout << "Enter data filename: ";
std::cin >> data_file;
// Open file and check if successful
std::ifstream course_stream(data_file);
if (!course_stream.is_open())
{
std::cout << "Unable to open file. Please run again" << std::endl;
return 1;
}
while (std::getline(course_stream, line)) //while the end of file is NOT reached
{
std::istringstream iss(line);
iss >> course_mark;
course_mark_vector.push_back(course_mark);
iss >> course_code;
course_code_vector.push_back(course_code);
std::getline(iss >> std::ws, course_name);
course_name_vector.push_back(course_name);
++i; //increment number of lines
}
course_stream.close(); //closing the file
std::cout << "Number of entries: " << i << std::endl;
return 0;
}
Demo