import java.util.*;

class ErrRandom {

  public static void errorExample() {
    double x0 = (double)1e-6;
    double x1 = 3;

    double a00 = (double)1e15;
    double a01 = 2;
    double b0 = x0*a00 + x1*a01;

    double a10 = (double)1e-15;
    double a11 = 1;
    double b1 = x0*a10 + x1*a11;

    // Solution by eliminating x0 first
    double y1 = (b0*a10 - b1*a00)/(a01*a10 - a11*a00);
    double y0 = (b0 - a01*y1)/a00;
    // Solution by back-substituting in second eqn
    double y_0 = (b1 - a11*y1)/a10;
    double y__0 = (b1/a10 - a11*y1/a10);

    // Solution by eliminating x1 first
    double z0 = (b0*a11 - b1*a01)/(a00*a11 - a10*a01);
    double z1 = (b0 - a00*z0)/a01;
    // Solution by back-substituting in second eqn
    double z_1 = (b1 - a10*z0)/a11;

    System.err.println("y0 is "+y0);
    System.err.println("y1 is "+y1);
    System.err.println("y_0 is "+y_0);
    System.err.println("y__0 is "+y__0);

    System.err.println("z0 is "+z0);
    System.err.println("z1 is "+z1);
    System.err.println("z_1 is "+z_1);
  } // End errorExample()

  public static void sysErrEx() {
    for(int i = 0; i < 10; i++) {
	System.out.print(i+",");
	for(int j = 0; j < 10000000; j++) {
	  double x = Math.sqrt(921218291);
	}
    }
    System.out.println();
  }

  public static void main(String[] args) {
    //errorExample();
    //sysErrEx();
    randomExample();
  }

  public static void randomExample() {

    //Random r1 = new Random();
    Random r1 = new Random(101);
    for(int i = 0; i < 10; i++) {
      System.out.println("Random number is "+r1.nextDouble());
    }

    double sum = 0;
    for(int i = 0; i < 100; i++) {
      sum += r1.nextDouble();
    }
    System.out.println("Average is "+sum/100);

  } // End randomExample()

} // End class ErrRandom