C++ fstream help?

I am trying to open a file in fstream with an integer as part of the name. The integer is a variable that needs to be able to be changed. So i can open files like "1.txt", "2.txt" and so on.


Kind of what I am trying now:


fstream outfile;


int i;


for(i=0;i%26lt;10;i++)


{


outfile.open( ( i + ".txt"), fstream::app);


//do stuff to outfile


outfile.close();


}

C++ fstream help?
mapaghimagsik gives some good advice in using stringstream and normally I prefer the C++ way but sometimes falling back to the old C way is shorter.





#include %26lt;iostream%26gt;


#include %26lt;string%26gt;


#include %26lt;fstream%26gt;





using namespace std;





int main()


{


char filename[20];





fstream outfile;





for (int i = 0; i %26lt; 10; ++i)


{


sprintf(filename, "%d.txt", i);





outfile.open(filename, ios::out | ios::app);





if (! outfile)


{


cout %26lt;%26lt; "error opening " %26lt;%26lt; filename %26lt;%26lt; endl;


}





//do stuff to outfile...





outfile.close();


}


}
Reply:You need to convert i to a string to concatenate





std::stringstream str(std::stringstream::in);





std::stringstream s (std::stringstream::in | std::stringstream::out);


std::string s1;


s %26lt;%26lt; 1 %26lt;%26lt; ".txt";





s %26gt;%26gt; s1;


std::cout %26lt;%26lt; s1%26lt;%26lt; std::endl;