#include <stdio.h>
#define  M 10
main(void)
{
  long i, j=0;
  double x, y;
  for (i=0; i<M; i++) {
    x = ((double) rand())/0x80000000;
    y = ((double) rand())/0x80000000;
    if (x*x + y*y < 1) j++;
    printf("(%f,%f)\n",x,y);
  }
  printf("pi is nearly %.10f\n", ((double) 4*j)/M);
}