How to create multiple file in fstream with loop [duplicate] - c++

Question

This question already has answers here:
How to concatenate a std::string and an int
(25 answers)
Closed 2 years ago.
I am new in coding and in this community I want to save multiple student info in multiple file in ".txt" file like "student1.txt", "student2.txt", "student3.txt" etc. See my code then I hope you will understand my problem.
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
int main() {
for(int i = 1; i < 30; i++) {
string name, roll, gpa;
cout << "Enter student info";
cout << "name :";
cin >> name;
cout << "\nEnter Roll :";
cin >> roll;
cout << "\nEnter gpa :";
cin >> gpa;
ofstream file;
/* Problem part :I know this part of code will never work */
file.open("Student <<i<<".txt");
/* what should I do */
file << name << endl << roll << endl << gpa;
file.close();
}
}

Answer 1

Here is what I think you need: std::to_string and operator+ (string)
Check out the answers on this thread. There they have shown numerous methods to do this.
Code:
#include <fstream>
#include <iostream>
#include <string>
int main() {
for (int i = 1; i < 30; i++) {
std::string name, roll, gpa;
std::cout << "Enter student info : " << std::endl;
std::cout << "Name : ";
std::cin >> name;
std::cout << "Enter roll number : ";
std::cin >> roll;
std::cout << "Enter GPA : ";
std::cin >> gpa;
std::ofstream file("Student" + std::to_string(i) + ".txt");
file << name << std::endl
<< roll << std::endl
<< gpa << std::endl;
}
}