POINTS of Mouse

#include <GL/glut.h>
#include<stdlib.h>
#include<stdio.h>
#include<iostream>
  int ww=600,wh=400;
  int first=0;



  void drawLine()
  {

  }


  void display()
 {     glClearColor(0.0,0.0,0.0,1.0);
       glClear(GL_COLOR_BUFFER_BIT);
       glFlush();
 }


  void mouse(int btn,int state,int x,int y)
  {
	  if(btn == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
	  {
		  exit(1);
	  }

	  else if(btn == GLUT_RIGHT_BUTTON && state == GLUT_DOWN)
	  {
		  printf("%d %d\n", x,y);
		  glBegin(GL_POINTS);
		  glVertex2f(x,wh-y);

		  glEnd();
		  glFlush();

	  }
  }

  void reshape()
  {
       glViewport(0,0,ww,wh);
       glMatrixMode(GL_PROJECTION);
       glLoadIdentity();
       gluOrtho2D(0.0,(GLdouble)ww,0.0,(GLdouble)wh);
       glMatrixMode(GL_MODELVIEW);
  }


  int main(int argc,char** argv)
  {
       glutInit(&argc,argv);
       glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
       glutInitWindowSize(ww,wh);
	   glutCreateWindow("Draw Line With Mouse Click");
       glutDisplayFunc(display);
       reshape();
      glutMouseFunc(mouse);
       glutMainLoop();
       return 0;
  }