#include <random>
#include <iostream>

struct cSystem
{
   cSystem();

   double sPositionX;
   double sPositionY;
   double sMass;

   static std::uniform_real_distribution<double> unif;
   static std::default_random_engine re;
};

std::uniform_real_distribution<double> cSystem::unif(-100, 100);
std::default_random_engine cSystem::re;

//Constructor
cSystem::cSystem()
{
   /*Initialization of data members*/
   sMass=1.0014;
   sPositionX= unif(re);
   sPositionY= unif(re);
}

void getPositions(cSystem* systems)
{
   for (unsigned i = 0; i < 3; ++i )
   {
      std::cout << systems[i].sPositionX << " " << systems[i].sPositionY << std::endl;
   }
}

int main (void)
{
   cSystem systems[3];

   getPositions(systems);

   return 0;
}