How to draw polygon in c programming language using openGL utility toolkit like glut and glew

Polygon

code:

	//necessary header
	#include<stdlib.h>
	#include<math.h>
	#include<Windows.h>
	//Opengl utilities
	#include <GL\glew.h>
	#include<GL/GLU.h>
	#include<GL/GL.h>
	#include <GL\freeglut.h>
	//function initialization and definition
	void display(void) {
	//clearing all pixel
	glClear(GL_COLOR_BUFFER_BIT);
	//draw white polygon (rectangle) with corner at (0.25,0.25, 0.0) and (0.75,0.75,0.0)
	glColor3f(1.0,1.0,1.0);
	glBegin(GL_POLYGON);
	glVertex3f(0.25,0.25,0.0);
	glVertex3f(0.75,0.25,0.0);
	glVertex3f(0.75,0.75,0.0);
	glVertex3f(0,1,0);
	glVertex3f(0.25,0.75,0.0);
	glEnd();
	//start processing openGL routine
	glFlush();
	}
	void init(void) {
	//for background
	glClearColor(0.0,0.0,0.0,0.0);
	//initializing viewing values
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	// left, right, buttom, top, zNear, zFar
	glOrtho(0.0,1.0,0.0,1.0,-1.0,1.0);
	}
	//main function
	//declare initial window size, position, and display mode (single buffered and RBGA)
	//open window with "Polygon" in title bar
	//call initialization routine
	//register call back function
	//enter main loop and process event
	int main(int argc, char* argv[]) {
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
	glutInitWindowSize(250,250);
	glutInitWindowPosition(100,100);
	glutCreateWindow("Polygon");
	init();
	glutDisplayFunc(display);
	glutMainLoop();
	return(0);
	}

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