I need explanation for this code in form of comments

This function saves the new file----------------------------------------
void savefile(struct datavalues d)
{       
    string newfilename;
    cout << "Enter the new file name with proper extension"<< endl;
    cin >> newfilename; 
    ofstream file(newfilename);
    file<<d.totalcol<<endl;
    file<<d.titles<<endl;
    for(int i=0;i<d.totalcol;i++)
        file<<d.computablecols[i]<<",";
    file<<endl;
    file<<d.totalrow<<endl;
    for(int i=0;i<d.totalrow;i++)
    {
        for(int j=0;j<d.totalcol;j++)
        {
            file<<d.fulldata[i][j]<<" ";
        }
        file<<endl;
    }
    file.close();
    string str="Created and saved a newfile as "+newfilename+"\n";
    cout<<str;
    logrecord(str);
    viewfunc(d);
}