Question

My problem is how to write a 2-dimensional vector to text file.

I already follow the topic here and here is my code a bit changed to my need :

ofstream output_file("example.txt");
ostream_iterator<int> output_iterator(output_file, "\t");
for ( int i = 0 ; i < temp2d.size() ; i++ ) 
copy(temp2d.at(i).begin(), temp2d.at(i).end(), output_iterator);

my question is how to write the vector to the file row by row ?

This is what I want:

22 33 44
66 77 88
88 44 22

and so on.

This code writes all the elements of the vector in the same line.

Thanks.

Answer 1

print out a new line character once you’ve copied the row, i.e. at the end of your for loop:

for(...)
{
  : // other code
  output_file << '\n';
}