circle by cxmac

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//#include <GL/gl.h> #include <GL/glut.h> #include <stdlib.h> #include <math.h> #define PI 3.1415926535898 void display (void) {     //to first clear all the pixels     glClear (GL_COLOR_BUFFER_BIT);          float angle = 0.0;     GLint circle_points = 100;     glBegin(GL_POINTS);         glColor3s(1, 1, 1);         for ( int i = 0; i < circle_points; i++ ) {             angle = ( 2 * PI * i ) / circle_points;             glVertex2f( cos(angle), sin(angle) );         }     glEnd();