How to write a data to file each in separate line?

Question

I would like to write to file data each in separate line. The code is show below:

#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
void writeToFile(const vector<double> &data){
    ofstream outFile("newData.txt", std::ofstream::binary);
    double num1 = 1, num2 = 2, num3 = 4;
    for (const auto &it : data) {
        outFile << it << endl;
    }
    outFile.close();
}
int main(){
    vector<double> data { 1, 2, 3, 4 };
    writeToFile(data);
    return 0;
}

The output of the "newData.txt" file is:

123

I would like to get:

1
2
3

I use endl, but it doesn't work. Have you some idea how to solve it? Thanks.

Answer 1

Don't use std::ofstream::binary for text files. Open as:

ofstream outFile("newData.txt", std::ofstream::out);

or equivalently just:

ofstream outfile("newData.txt");

Answer 2

Its because you are opening the file in binary mode. Try ofstream outFile("new.txt"), this will open the file in text mode and endl should now write numbers in separate line.