How to create a CSV file in C++
By Pritam HandeIn this tutorial, we will learn how to create a CSV file in C++.
What is a CSV file?
- It is a plain text file that stores data.
- Each row of this file contains data separated by a comma.
- It helps in exchanging data between different applications.
- The extension of a CSV file is .csv .
Structure of a CSV file
It has a very simple structure. It just contains rows of data separated by commas.
For ex.
The above data will be represented in a CSV file as follows:
Now, let’s see the program to create a CSV file.
Program to create a CSV file in C++
#include<iostream>
#include<fstream> //used for file handling
#include<string> //used for strings
using namespace std;
/*Everytime before running this program delete previously created 'Student_data.csv' file to avoid buffer overflow errors*/
int main()
{
int roll_no;
string name,college,class_of_student;
fstream fout;
// opening an existing csv file or creating a new csv file
fout.open("Student_data.csv", ios::out);
fout<<"Name"<<","<<"College"<<","<<"Class"<<","<<"Roll no"<<"\n";
cout<<"Enter details of 5 students=>";
for(int i=1; i<=5; i++)
{
cout<<"\nName of student "<<i<<" :";
getline(cin,name);
cout<<"College of student "<<i<<" :";
getline(cin,college);
cout<<"Class of student "<<i<<" :";
getline(cin,class_of_student);
cout<<"Roll no of student "<<i<<" :";
cin>>roll_no;
cin.ignore(); /* if we use getline fun after cin function then it will skip 1 input. To avoid this we need to use 'cin.ignore()' fun to flush newline out of the buffer*/
fout<<name<<","<<college<<","<<class_of_student<<","<<roll_no<<"\n"; // writing data to a csv file
}
fout.close(); // closing csv file
fstream fin;
string data;
cout<<"\nCSV file has been successfully created..!!";
cout<<"\n\nDisplaying the content of CSV file=>\n\n";
// opening existing csv file in read mode
fin.open("Student_data.csv", ios::in);
for(int i=0; i<=5; i++)
{
// getline fun will read one entire row of csv file and will store it in string 'data'
getline(fin,data);
cout<<data<<"\n";
}
return 0;
}
Input/Output:
Enter details of 5 students=> Name of student 1 :Virat College of student 1 :abc college Class of student 1 :BE-2 Roll no of student 1 :18 Name of student 2 :Rohit College of student 2 :xyz college Class of student 2 :TE-1 Roll no of student 2 :45 Name of student 3 :Hardik College of student 3 :pqr college
Class of student 3 :TE-3 Roll no of student 3 :33 Name of student 4 :Shikhar College of student 4 :abc college Class of student 4 :BE-1 Roll no of student 4 :25 Name of student 5 :Ms College of student 5 :pqr college Class of student 5 :BE-2 Roll no of student 5 :7 CSV file has been successfully created..!! Displaying the content of CSV file=> Name,College,Class,Roll no Virat,abc college,BE-2,18 Rohit,xyz college,TE-1,45 Hardik,pqr college,TE-3,33 Shikhar,abc college,BE-1,25 Ms,pqr college,BE-2,7
Time Complexity
O(n), Where n is a no. of rows of data.
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