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

double sqr(double n)
{
    return n*n;
}

double deg2rad(double n)
{
    return M_PI*n/180;
}

double wgs84_dist(double lat1, double lon1, double lat2, double lon2)
{
    double b1, l1, b2, l2, a, f, ff, gg, l, ss, cc, w, rr, dd, h1, h2, s;

    b1=deg2rad(lat1);
    l1=deg2rad(lon1);
    b2=deg2rad(lat2);
    l2=deg2rad(lon2);

    a=6378137.000;
    f=1/298.257223563;

ff= (b1+b2)/2;
gg = (b1-b2)/2;
l = (l1-l2)/2;

 ss = sqr(sin(gg))*sqr(cos(l)) + sqr(cos(ff))*sqr(sin(l));
 cc = sqr(cos(gg))*sqr(cos(l)) + sqr(sin(ff))*sqr(sin(l));
 w = atan(sqrt(ss/cc));

 rr = sqrt(ss*cc)/w;
 dd = 2*w*a;
 h1 = (3*rr-1)/(2*cc);
 h2 = (3*rr+1)/(2*ss);


  s = dd*(1 + f*h1*sqr(sin(ff))*sqr(cos(gg))
          - f*h2*sqr(cos(ff))*sqr(sin(gg)));

  return s;
}