#include "stdafx.h"

#include <GL/glut.h>

#include <stdlib.h>

#include <math.h>

#include <stdio.h>

const int n = ;

const GLfloat R = 0.5f;

const GLfloat PI = 3.24250265357f;

void myDisplay(void) {

    glClear(GL_COLOR_BUFFER_BIT);

    glBegin(GL_POLYGON);

    for (int i = ; i<n; i++) {

        glVertex2f(R*cos( * PI / n*i), R*sin( * PI / n*i));

    }

    glEnd();

    glFlush();

}

int main(int argc, char *argv[]) {

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);

    glutInitWindowPosition(, );

    glutInitWindowSize(, );

    glutCreateWindow("OpenGL画圆程序");

    glutDisplayFunc(&myDisplay);

    glutMainLoop();

    return ;

}