>>326
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>

#define Nx 1
#define Ny 2

int main()
{
     double x, y, s;
     int n, count_in = 0, count_out = 0;
     srand((unsigned int)time(NULL));

    for(n = 0; n < 10000; n++){
         x = ((double)rand()/RAND_MAX)*Nx + 1;
         y = ((double)rand()/RAND_MAX)*Ny + 1;
        if(x >= 1 && y >= 1 && pow(x-1, 2) + pow(y-2, 2) <= 1)
             count_in++;
         else
             count_out++;
    }

     s = (double)count_in/(count_in + count_out)*Nx*Ny;
     printf("s = %f\n", s);
     printf("pi = %f\n", 2*s);

     return 0;
}