ROS built-in primitive types not declared

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Hello, I am new in using ROS. I see a problem with ROS built-in primitive type, such as int16.

Here is the code, it is very simple.

#include <ros/ros.h>

int main(int argc, char** argv)                                                                   
{                                                                                                 
  int16 i = 0;
  ros::init(argc, argv, "data_broadcaster");                                                      
  ros::NodeHandle n;

  ros::Rate loop_rate(100);

  while(ros::ok())                                                                                
  {
    loop_rate.sleep();
    i = i + 4;
    if (i == 360) i = 0;                                                                          
  }                                                                                               
  return 0;                                                                                       
}

I run catkin_make to build the code and get the following error.

[ 50%] Building CXX object data_capturer/CMakeFiles/data_broadcaster.dir/src/data_broadcaster.cpp.o
/home/kening/catkin_ws_2/src/data_capturer/src/data_broadcaster.cpp: In function ‘int main(int, char**)’:
/home/kening/catkin_ws_2/src/data_capturer/src/data_broadcaster.cpp:5:3: error: ‘int16’ was not declared in this scope
   int16 i = 0;
   ^
/home/kening/catkin_ws_2/src/data_capturer/src/data_broadcaster.cpp:17:5: error: ‘i’ was not declared in this scope
     i = i + 4;
     ^
data_capturer/CMakeFiles/data_broadcaster.dir/build.make:62: recipe for target 'data_capturer/CMakeFiles/data_broadcaster.dir/src/data_broadcaster.cpp.o' failed
make[2]: *** [data_capturer/CMakeFiles/data_broadcaster.dir/src/data_broadcaster.cpp.o] Error 1
CMakeFiles/Makefile2:837: recipe for target 'data_capturer/CMakeFiles/data_broadcaster.dir/all' failed
make[1]: *** [data_capturer/CMakeFiles/data_broadcaster.dir/all] Error 2
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2

My CMakeLists.txt is:

cmake_minimum_required(VERSION 2.8.3)
project(data_capturer)
find_package(catkin REQUIRED COMPONENTS
  roscpp
  rospy
  std_msgs
)
catkin_package()
include_directories(
  ${catkin_INCLUDE_DIRS}
)
add_executable(data_broadcaster src/data_broadcaster.cpp)
add_dependencies(data_broadcaster
  ${data_broadcaster_EXPORTED_TARGETS}
  ${catkin_EXPORTED_TARGETS}
)
target_link_libraries(data_broadcaster
  ${catkin_LIBRARIES}
)

My package.xml is:

<?xml version="1.0"?>
<package>
  <name>data_capturer</name>
  <version>0.0.0</version>
  <description>The data_capturer package</description>
  <maintainer email="myemail@whereisit.com">Ku</maintainer>
  <license>BSD</license>

  <buildtool_depend>catkin</buildtool_depend>
  <build_depend>roscpp</build_depend>
  <build_depend>rospy</build_depend>
  <build_depend>std_msgs</build_depend>
  <run_depend>roscpp</run_depend>
  <run_depend>rospy</run_depend>
  <run_depend>std_msgs</run_depend>

  <export>
  </export>
</package>

I could not figure out why int16 is not declared. Did I forget to include any header file. Or is there something wrong with my CMakeLists.txt and package.xml?

Please help. Thank you. -Kening