float point exception, waiting for debugging

src/races.cc

@@ -0,0 +1,68 @@
+#include "races.h"
+
+#include <algorithm>
+#include <math.h>
+
+shade::shade(const position_list &available_positions):
+        character{race::rshade} {
+        pos = available_positions[rng.rand_under(available_positions.size())];
+        gold = 0;
+        hostile = true;
+}
+
+// IMPORTANT: remember to check if player is on the stairs
+result shade::move(const direction dir,
+                   const position_list &available_positions) {
+        if (find(available_positions, pos + MOVE[dir])
+            != available_positions.size()) {
+                pos += MOVE[dir];
+                return result::moved;
+        }
+
+        return result::fine;
+}
+
+result shade::attack(const direction dir, const character_list &chlist) {
+        position tmp{pos + MOVE[dir]};
+
+        for (auto &ch : chlist)
+                if (tmp == ch->get_position()) {
+                        return ch->get_hit(race, ATK, base_hitrate);
+                }
+
+        return result::fine;
+}
+
+result shade::move_or_attack(const direction dir,
+                             const position_list &available_positions,
+                             const character_list &chlist) {
+        position tmp{pos + MOVE[dir]};
+
+        if (find(available_positions, tmp)
+            != available_positions.size()) {
+                pos = tmp;
+                return result::moved;
+        }
+
+        for (auto &ch : chlist)
+                if (tmp == ch->get_position()) {
+                        return ch->get_hit(race, ATK, base_hitrate);
+                }
+
+        return result::fine;
+}
+
+int calc_dmg(const int ATK, const int DEF) {
+        return ceil((100 / (100 + DEF)) * ATK);
+}
+
+result shade::get_hit(const enum race &race, const int atk,
+                      const float hitrate) {
+        if (rng.rand_num() <= hitrate * (float)RAND_MAX) // This is a hit!
+                HP = std::max(HP - calc_dmg(atk, DEF), 0);
+
+        if (HP == 0)
+                return result::died;
+
+        return result::hit;
+}