why does character_arrays.exe has stopped working error pop up?

my code is working fine. Its showing the right results in the file but after executing the code,an error message pops up saying "character_array.exe has stopped working". Can anyone tell why that error appears??

#include <iostream>
#include<cstring>
#include<fstream>
#include<string>
using namespace std;

int main()
{
    string name[20], roll_no[20];
    int price[20], k=0;
  ifstream data;
  ofstream dout;
  char fname[4];
  char fname1[]={"dout"};
  cout<<"enter file name : ";
  cin.getline(fname, 20);
  if(strcmp(fname,fname1) !=0)
  {
      cout<<"file names do not match";
  }
  else{
  data.open("new.txt");
  while(!data.eof())
  {
      for(int i=0; i<20; i++)
      {
          data>>name[i]>>roll_no[i]>>price[i];
          k++;
      }
  }
  data.close();
   cout<<"data in the text file is:"<<endl;
  for(int i=0; i<6; i++)
  {
     cout<<name[i]<<"  "<<roll_no[i]<<"  "<<price[i]<<endl;
  }

  dout.open("output.txt");
  for(int i=0; i<6; i++)
  {
      dout<<name[i]<<"  "<<roll_no[i]<<"  "<<price[i]<<endl;
  }
  }

return 0;
}