COMP: Prefer the C++ headers over the C99 headers

Using the C++11 headers keeps the library cleaner and more
rigorously scoped use of namespaces.

include/json/assertions.h

@@ -7,7 +7,7 @@
 #define CPPTL_JSON_ASSERTIONS_H_INCLUDED
 
 #include <sstream>
-#include <stdlib.h>
+#include <cstdlib>
 
 #if !defined(JSON_IS_AMALGAMATION)
 #include "config.h"

include/json/config.h

@@ -5,8 +5,8 @@
 
 #ifndef JSON_CONFIG_H_INCLUDED
 #define JSON_CONFIG_H_INCLUDED
-#include <stddef.h>
+#include <cstddef>
-#include <stdint.h> //typedef int64_t, uint64_t
+#include <cstdint> //typedef int64_t, uint64_t
 #include <string>   //typedef String
 
 /// If defined, indicates that json library is embedded in CppTL library.

src/jsontestrunner/main.cpp

@@ -16,7 +16,7 @@
 #include <algorithm> // sort
 #include <json/json.h>
 #include <sstream>
-#include <stdio.h>
+#include <cstdio>
 
 struct Options {
   JSONCPP_STRING path;

src/lib_json/json_value.cpp

@@ -10,7 +10,7 @@
 #endif // if !defined(JSON_IS_AMALGAMATION)
 #include <cassert>
 #include <cstring>
-#include <math.h>
+#include <cmath>
 #include <sstream>
 #include <utility>
 #ifdef JSON_USE_CPPTL

src/lib_json/json_writer.cpp

@@ -28,8 +28,8 @@
 #endif
 
 #else
-#include <math.h>
+#include <cmath>
-#include <stdio.h>
+#include <cstdio>
 
 #if defined(_MSC_VER)
 #if !defined(isnan)

src/test_lib_json/jsontest.cpp

@@ -5,7 +5,7 @@
 
 #define _CRT_SECURE_NO_WARNINGS 1 // Prevents deprecation warning with MSVC
 #include "jsontest.h"
-#include <stdio.h>
+#include <cstdio>
 #include <string>
 
 #if defined(_MSC_VER)

src/test_lib_json/jsontest.h

@@ -11,7 +11,7 @@
 #include <json/value.h>
 #include <json/writer.h>
 #include <sstream>
-#include <stdio.h>
+#include <cstdio>
 #include <string>
 
 // //////////////////////////////////////////////////////////////////