`#include <iostream>`
  #include <fstream>
  #include <string>
  #include <cstdlib>
  using namespace std;

  void show() // this function displays the file content
  {

  string file_nm, STRING;
  int i =0;
  cout<<"Please enter a file name: ";
  cin>>file_nm;

  ifstream infile;
  if (infile.good())
  {
  infile.open ("file_nm");
  while(!infile.eof()) // To get you all the lines.
  {
  getline(infile,STRING); // Saves the line in STRING.
  cout<<STRING; // Prints our STRING.
  }
  infile.close();
  }
  else
  {
  cout<< "Error opening the file: ";
  }


  i++;
  if (i%20==0)
  {
  system("pause");
  }

  }


  void add() // Appends to the end of the file
  {
  string txt, file_nm;
  cout<<"Enter a file name: ";
  cin>> file_nm;
  cout<<"Please enter a name to add to the file: ";
  cin>> txt;
  std::ofstream outfile;
  outfile.open(file_nm.c_str());
  outfile << file_nm;
  {
  outfile.close();
  }
  system("Pause");
  }
  int main(int argc, char *argv[])
  {
  //show();

  int cont = 1, choose;

  while(cont==1)

  {

  cout << "Main menun";
  cout <<"1) Show a listn";
  cout << "2) Add a namen";
  cout << "3) Exitn";
  cout<<" Please enter which option you want: "<<endl;
  cin >> choose;
  switch (choose)
  {
  case 1:
  show();
  break;
  case 2:
  add();
  break;
  case 3:
  cont=2;
  break;
  default:
  cout<<"BAD INPUT"<<endl;
  break;
  }



 }
 return  EXIT_SUCCESS;
 }