#define GLUT_DISABLE_ATEXIT_HACK
#include <windows.h>
#include <gl/glut.h>
#include <math.h>
#define PI 3.14159
#define circlePoints 64
int i;
void display()
{
    GLfloat angleStep=2*PI/(float)circlePoints;
    //Gluint pointPerQuarter=circlePoints/4;
    GLfloat x[circlePoints];
    GLfloat y[circlePoints];
    GLfloat radius=10;
    glClearColor(0,0,0,0);
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1,1,1);
    glLineWidth(10);
    for(i=0;i<circlePoints;i++)
    {
        //Define points in first quadrant
        x[i]=5+radius*cos(i*angleStep);
        y[i]=-5+radius*sin(i*angleStep);
    }
    glBegin(GL_LINE_LOOP);
    for (i=0;i<circlePoints;i++)
    {
        glVertex2f(x[i],y[i]);
    }
    glEnd();
    glFlush();
}

int main(int argc, char** argv)
{
    glutInit(&argc,argv);
    glutInitWindowPosition(50,50);
    glutInitWindowSize(640,480);
    glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
    glutCreateWindow("Circle Drawing");
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(-32,32,-24,24);
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;
}