#include<cstdio>
#include<cmath>
int main()
{
   double a, b;
   long double A, B;

   a = 1; b = 3;
   A = 1; B = 3;

   a /= b;
   A /= B;

   B = a; // double > long double
   int res;
   res = A==B;

   printf("Comparing d & ld: %d\n", res);

   b = A; // long double > double
   res = a==b;
   printf("Comparing d & d:  %d\n", res);

   double diff = A-a;
   printf("%.50lf\n", diff);
   return 0;
}