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

struct position {
  double x;
  double y;
};

struct segment {
  struct position pi;
  struct position pf;
};

struct triplet {
  struct segment s1;
  struct segment s2;
  struct segment s3;
};

double calculerLongueurSegment(struct segment s) {
  return sqrt(pow(s.pi.x - s.pf.x, 2.0) + pow(s.pi.y - s.pf.y, 2.0));
}

double calculerLongueurMaxSegments(struct triplet trp) {
  double l1 = calculerLongueurSegment(trp.s1);
  double l2 = calculerLongueurSegment(trp.s2);
  double l3 = calculerLongueurSegment(trp.s3);
  if ((l1 >= l2) && (l1 >= l3)) {
    return l1;
  }
  if (l2 >= l3) {
    return l2;
  }
  return l3;
}

void main(void) {
  printf("%zu %zu %zu\n", sizeof(struct triplet),
    sizeof(struct segment),
    sizeof(struct position));
  struct triplet trp = { { {  1.2, 3.4 },{ -2.3, 4.6 } },
                         { {  4.5,-5.6 },{  7.2, 1.4 } },
                         { { -5.3, 0.0 },{ -1.3, 8.9 } } };
  printf("%zu %zu %zu\n", sizeof(trp), sizeof(trp.s2), sizeof(trp.s2.pi));
  printf("\n");
  printf("Longueur maximale des segments : %lf\n", calculerLongueurMaxSegments(trp));
}