Question

C++ Parse text (with delimiter) read from file.

If a Text file has input formatted such as: "name,23" on every line where a comma is the delimiter, how would I separate the string "name" and integer "23" and set them to separate variables for every input of the text file? I am trying to set a name and age to an object and insert it into a vector.

#include <iostream>
#include <vector>
#include <fstream>
using namespace std;

class Student{
    public:
        string name;
        int age;
};

int main() {

    vector <Student>studentVector;
    Student s;
    string student_name;
    int student_age;
  
    ifstream myFile("file.txt");
      
    while(myFile>> student_name >> student_age){

        //s.name is assigning the entire line of unparsed text
        s.name = student_name;

       ///age is not read because input string from file is not parsed

        s.age = student_age;

        studentVector.push_back(s);
    }

    return 0;
}

Answer 1

working code :

#include <iostream>
#include <vector>
#include <fstream>
using namespace std;

class Student{
public:
string name;
int age;
};

int main() {
vector <Student>studentVector;
Student s;
string student_details;
ifstream myFile("file.txt");

while(myFile>> student_details){
int index_of_comma = student_details.find(','); // finding the index of comma(',')
  
s.name = student_details.substr(0,index_of_comma);// get the string from 0 to index_of_comma and store ot to s.name
  
s.age = stoi(student_details.substr(index_of_comma+1,student_details.size())); // form index_of_comma+1 to the last stroe it in s.age
  
// stoi is used to convert the string of number into integer
cout<<"student name is :"<<s.name<<"\nstudent age is :" <<s.age<<endl; // printing values

studentVector.push_back(s); // inserting details of student into vector
}

return 0;
}

if any doubt, comment below