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#include <GL/glut.h>#include <math.h>
const GLfloat Pi = 3.1415926536f;
void myDisplay(void)
{GLfloat a = 1 / (2 - 2 * cos(72 * Pi / 180));GLfloat bx = a * cos(18 * Pi / 180);GLfloat by = a * sin(18 * Pi / 180);GLfloat cy = -a * cos(18 * Pi / 180);GLfloatPointA[2] = { 0, a },PointB[2] = { bx, by },PointC[2] = { 0.5, cy },PointD[2] = { -0.5, cy },PointE[2] = { -bx, by };glClear(GL_COLOR_BUFFER_BIT);// 按照A->C->E->B->D->A的顺序，可以一笔将五角星画出glBegin(GL_LINE_LOOP);glVertex2fv(PointA);glVertex2fv(PointC);glVertex2fv(PointE);glVertex2fv(PointB);glVertex2fv(PointD);glEnd();glFlush();
}int main(int argc, char* argv[])
{glutInit(&argc, argv);glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);glutInitWindowPosition(100, 100);glutInitWindowSize(400, 400);glutCreateWindow("第一个OpenGL程序");glutDisplayFunc(&myDisplay);glutMainLoop();return 0;
}

（一）glVertex2i(1, 3);
（二）glVertex2f(1.0f, 3.0f);
（三）glVertex3f(1.0f, 3.0f, 0.0f);
（四）glVertex4f(1.0f, 3.0f, 0.0f, 1.0f);
（五）GLfloat VertexArr3[] = {1.0f, 3.0f, 0.0f};
glVertex3fv(VertexArr3);