diff --git a/src/Boss.cpp b/src/Boss.cpp
index 86b17aec..498656e6 100644
--- a/src/Boss.cpp
+++ b/src/Boss.cpp
@@ -36,7 +36,9 @@ void InitBossChar(int code)
 void PutBossChar(int fx, int fy)
 {
 	char a = 0;
-	for (int b = BOSS_MAX - 1; b >= 0; b--)
+	int b;
+
+	for (b = BOSS_MAX - 1; b >= 0; --b)
 	{
 		if (gBoss[b].cond & 0x80)
 		{
@@ -78,17 +80,17 @@ void SetBossCharActNo(int a)
 
 void HitBossBullet()
 {
-	int bos;
-	int bul;
-	int bos_;
 	BOOL bHit;
+	int bul;
+	int bos;
+	int bos_;
 
-	for (bos = 0; bos < BOSS_MAX; bos++)
+	for (bos = 0; bos < BOSS_MAX; ++bos)
 	{
 		if ((gBoss[bos].cond & 0x80) == 0)
 			continue;
 
-		for (bul = 0; bul < BULLET_MAX; bul++)
+		for (bul = 0; bul < BULLET_MAX; ++bul)
 		{
 			if ((gBul[bul].cond & 0x80) == 0)
 				continue;
@@ -180,7 +182,7 @@ void HitBossBullet()
 				}
 				else
 				{
-					if (!(gBul[bul].bbits & 0x10))
+					if ((gBul[bul].bbits & 0x10) == 0)
 					{
 						SetCaret(gBul[bul].x, gBul[bul].y, 2, 2);
 						PlaySoundObject(31, 1);
@@ -224,11 +226,9 @@ void ActBossChar()
 
 	gpBossFuncTbl[code_char]();
 
-	for (bos = 0; bos < BOSS_MAX; bos++)
-	{
+	for (bos = 0; bos < BOSS_MAX; ++bos)
 		if (gBoss[bos].shock)
-			gBoss[bos].shock--;
-	}
+			--gBoss[bos].shock;
 }
 
 void HitBossMap()
@@ -275,7 +275,7 @@ void HitBossMap()
 	offy[14] = -1;
 	offy[15] = -1;
 
-	for (b = 0; b < BOSS_MAX; b++)
+	for (b = 0; b < BOSS_MAX; ++b)
 	{
 		int judg;
 
@@ -299,7 +299,7 @@ void HitBossMap()
 		}
 
 		gBoss[b].flag = 0;
-		for (j = 0; j < judg; j++)
+		for (j = 0; j < judg; ++j)
 		{
 			atrb[j] = GetAttribute(x + offx[j], y + offy[j]);