How to convert RGB to HSV using OpenCV

Hey 

 I am sharing a simple program  which convert RGB image into HSV color space. I am handling cv::Mat instead of IplImage.

hsv.cpp

  /// HSV Conversion  
 #include "opencv2/highgui/highgui.hpp"   
 #include "opencv/cv.h"  
 #include <iostream>   
 #include <stdio.h>   
 using namespace std;   
 using namespace cv;   
  int main(int argc,   
   char *argv[]   
  )   
  {   
  /// input and hsv image variable  
  cv::Mat input,hsv;  
  input =imread(argv[1],1);  
  ///hsv conversion  
  cvtColor(input,hsv,CV_RGB2HSV);  
 ///displaying hsv and input  
  cv::imshow("hsv",hsv);  
  cv::imshow("input",input);  
  waitKey();   
  return 0;   
  }