#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <math.h> 
using namespace std;

#define X_MIN -5
#define X_MAX 5
#define RAND_NUM 10000

double gaus(double x){
  //  return exp(-x*x/2.)/sqrt(2*M_PI);
  return exp(-x*x/2.);//normalize  gaus(0)=1
}

int main(int argc, char *argv[] )
{
  int i,bin;
  double x,r;

  srand(time(NULL));
  i=0;
  while(RAND_NUM>i){  
    x=(X_MAX-X_MIN)*((double)rand()/RAND_MAX-0.5);
    if((double)rand()/RAND_MAX<gaus(x)){
      cout<<x<<endl;
      i++;
    }
  }


    return 0;
}