diff --git a/cpp/include/phevaluator/card_sampler.h b/cpp/include/phevaluator/card_sampler.h
index 26d9447..bfe2bd5 100644
--- a/cpp/include/phevaluator/card_sampler.h
+++ b/cpp/include/phevaluator/card_sampler.h
@@ -10,12 +10,12 @@ namespace card_sampler {
 class CardSampler {
   std::array<int, 52> deck;
 
-public:
+ public:
   CardSampler(void);
   std::vector<int> sample(int size);
 };
-} // namespace card_sampler
+}  // namespace card_sampler
 
 #ifdef __cplusplus
-} // closing brace for extern "C"
+}  // closing brace for extern "C"
 #endif
diff --git a/cpp/src/card_sampler.cc b/cpp/src/card_sampler.cc
index a700f01..6b35487 100644
--- a/cpp/src/card_sampler.cc
+++ b/cpp/src/card_sampler.cc
@@ -1,7 +1,7 @@
+#include <phevaluator/card_sampler.h>
 #include <array>
 #include <chrono>
 #include <numeric>
-#include <phevaluator/card_sampler.h>
 #include <random>
 #include <utility>
 #include <vector>
@@ -11,7 +11,9 @@ static unsigned seed =
     std::chrono::system_clock::now().time_since_epoch().count();
 static std::default_random_engine generator(seed);
 
-CardSampler::CardSampler(void) { std::iota(deck.begin(), deck.end(), 0); }
+CardSampler::CardSampler(void) {
+  std::iota(deck.begin(), deck.end(), 0);
+}
 
 std::vector<int> CardSampler::sample(int size) {
   std::vector<int> ret;
@@ -25,4 +27,4 @@ std::vector<int> CardSampler::sample(int size) {
   }
   return ret;
 }
-} // namespace card_sampler
+}  // namespace card_sampler
diff --git a/cpp/test/evaluation_plo4.cc b/cpp/test/evaluation_plo4.cc
index 5828712..0a7e712 100644
--- a/cpp/test/evaluation_plo4.cc
+++ b/cpp/test/evaluation_plo4.cc
@@ -1,13 +1,13 @@
-#include <algorithm>
-#include <cstdio>
 #include <phevaluator/card_sampler.h>
 #include <phevaluator/phevaluator.h>
 #include <phevaluator/rank.h>
+#include <algorithm>
+#include <cstdio>
 #include <string>
 #include <vector>
 
-#include "kev/kev_eval.h"
 #include "gtest/gtest.h"
+#include "kev/kev_eval.h"
 
 using namespace phevaluator;
 
@@ -17,8 +17,8 @@ static int percentage(long long numerator, long long denominator) {
 
 static card_sampler::CardSampler cs{};
 
-static short IterateKevEval(int a, int b, int c, int d, int e, int f, int g,
-                            int h, int i) {
+static short
+IterateKevEval(int a, int b, int c, int d, int e, int f, int g, int h, int i) {
   short best = 20000;
 
   int board[10][3] = {
diff --git a/cpp/test/evaluation_plo5.cc b/cpp/test/evaluation_plo5.cc
index d2eb87c..5dbf913 100644
--- a/cpp/test/evaluation_plo5.cc
+++ b/cpp/test/evaluation_plo5.cc
@@ -1,13 +1,13 @@
-#include <algorithm>
-#include <cstdio>
 #include <phevaluator/card_sampler.h>
 #include <phevaluator/phevaluator.h>
 #include <phevaluator/rank.h>
+#include <algorithm>
+#include <cstdio>
 #include <string>
 #include <vector>
 
-#include "kev/kev_eval.h"
 #include "gtest/gtest.h"
+#include "kev/kev_eval.h"
 
 using namespace phevaluator;
 
@@ -17,8 +17,16 @@ static int percentage(long long numerator, long long denominator) {
 
 static card_sampler::CardSampler cs{};
 
-static short IterateKevEval(int a, int b, int c, int d, int e, int f, int g,
-                            int h, int i, int j) {
+static short IterateKevEval(int a,
+                            int b,
+                            int c,
+                            int d,
+                            int e,
+                            int f,
+                            int g,
+                            int h,
+                            int i,
+                            int j) {
   short best = 20000;
 
   int board[10][3] = {
diff --git a/cpp/test/evaluation_plo6.cc b/cpp/test/evaluation_plo6.cc
index 65ca621..46c5a48 100644
--- a/cpp/test/evaluation_plo6.cc
+++ b/cpp/test/evaluation_plo6.cc
@@ -1,13 +1,13 @@
-#include <algorithm>
-#include <cstdio>
 #include <phevaluator/card_sampler.h>
 #include <phevaluator/phevaluator.h>
 #include <phevaluator/rank.h>
+#include <algorithm>
+#include <cstdio>
 #include <string>
 #include <vector>
 
-#include "kev/kev_eval.h"
 #include "gtest/gtest.h"
+#include "kev/kev_eval.h"
 
 using namespace phevaluator;
 
@@ -17,8 +17,17 @@ static int percentage(long long numerator, long long denominator) {
 
 static card_sampler::CardSampler cs{};
 
-static short IterateKevEval(int a, int b, int c, int d, int e, int f, int g,
-                            int h, int i, int j, int k) {
+static short IterateKevEval(int a,
+                            int b,
+                            int c,
+                            int d,
+                            int e,
+                            int f,
+                            int g,
+                            int h,
+                            int i,
+                            int j,
+                            int k) {
   short best = 20000;
 
   int board[10][3] = {