Prims list

//Create Prime list on a file

//Author: Ahmed Sayed

#include <iostream>

#include <fstream>

using namespace std;

int main ()

{

  int num;

  cout << "Enter Range ";

  ofstream source;

  source.open("Prime List.txt");

cin >> num; 

 for (int x=1; x<num; x++)

{

  bool flag = true;

 

  for (int i = 2; i < x; i++)

  if (x%i==0)

    flag = false;

    

   if (flag)

  source << x << endl;

  }

  

system ("pause");

return 0;

}