#include "stdafx.h"#include <GL/glut.h>#include <stdlib.h>#include <math.h>#include <stdio.h>const int n = 50;const GLfloat R = 0.5f;const GLfloat PI = 3.24250265357f;void myDisplay(void) {    glClear(GL_COLOR_BUFFER_BIT);    glBegin(GL_POLYGON);    for (int i = 0; i<n; i++) {        glVertex2f(R*cos(2 * PI / n*i), R*sin(2 * PI / n*i));    }    glEnd();    glFlush();}int main(int argc, char *argv[]) {    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);    glutInitWindowPosition(100, 100);    glutInitWindowSize(500, 500);    glutCreateWindow("OpenGL画圆程序");    glutDisplayFunc(&myDisplay);    glutMainLoop();    return 0;}