Writing many txt files but with different numbers

[Vigii]

Hi,

I'm trying to create five txt files from one program.

Exactly what I want to do is to create file name as follows

Result-1.txt
Result-2.txt
Result-3.txt
.............
Result-n.txt

See my code and correct me.

ofstream myfile;
myfile.open ("Result.txt");                    
for (int t=2;t<=1.082/dt;t++)
{
   std::copy(y,y+n,uy);
      for(int i=2;i<=j-1;i++)
      {
       y[i]=uy[i]+((mu*dt/(2*dy*dy))*(uy[i+1]-(2*uy[i])+uy[i-1]));
       if ((t==90)||(t==180)||(t==270)||(t==360)||(t==450)||(t==540))
	 {
                myfile<<std::setprecision(16)<<y[i]<<'\t';
                myfile<<(i-1)*dy<<endl;                                                           
		cout<<i<<'\t'<<t<<'\t'<<y[i]<<endl;
	}

}         
} 

[AbstractionAnon]

ofstream::open accepts a character array, or in C++11 a std::string.
Simply build a character array or string with the file name you want.

C-style:

  char fname[20]; 
  sprintf (fname, "Result-%d.txt", n);
  myfile.open (fname);

C++ style:

  stringstream ss;
  ss << "Result-" << n << ".txt";
  myfile.open (ss.str().c_str());   // C++
  myfile.open (ss.str());              // C++11