renaming

#include <stdlib.h>

#include <stdio.h>

#include <time.h>

#define CPU_TIME_P ({ struct timespec myts; (clock_gettime( CLOCK_PROCESS_CPUTIME_ID, &myts ), \

                                             (double)myts.tv_sec + (double)myts.tv_nsec * 1e-9); })

typedef unsigned int uint;

int main ( int argc, char **argv )

{

  uint Nshots       = (argc>1 ? (uint)atoi(*(argv+1)) : 1000000 );

  uint valid_points = 0;

  srand48(time(NULL));

  double timing = CPU_TIME_P;

  for ( uint i = 0; i < Nshots; i++ )

    {

      // 1) generate x and y by rand48()

      // 2) check whether they are in the circle of radius 1

      // 3) increase the counter

      double x = drand48();

      double y = drand48();

      valid_points += (x*x + y*y <= 1);

    }

  timing = CPU_TIME_P - timing;

  printf("value of pi greek is: %g\n"

	 "elapsed time is %g sec\n",

	 (double)valid_points/Nshots * 4, timing);

  return 0;

}