I am learning computer graphics through reading <Computer Graphics Using OpenGL Second Edition>.

And I generated the Sierpinski gasket using OpenGL and VC++ 2005. There is the result:

There is the source code which can be compiled in visual studio 2005:

// Draw sierpinski gasket
//P49 in <Computer Graphics Using OpenGL>

#include "GLintPoint.h"
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

// Create a number between 0 and m(a number which will be given)
// the input m must be less than 32767 according to P49 in <Computer Graphics Using OpenGL>
int random(int m)
{
    if(m<0||m>32767)
    {
        cout<<"There is something wrong in random."<<endl;
    }
    int rand();
    return rand()%m;
}

void drawDot (GLint x, GLint y)
{
    glBegin(GL_POINTS);
        glVertex2i(x,y);
    glEnd();
}

// Draw sierpinski gasket
void sierpinski()
{
    GLint random(GLint);
    glClear(GL_COLOR_BUFFER_BIT);       //clear the screen

    GLintPoint T[3]={{10,10},{300,30},{200,300}};
    int index=random(3);       //0,1 or 2 equally likely
    GLintPoint point = T[index]; // initial point
    drawDot(point.x,point.y);     //draw initial point

    drawDot(T[0].x,T[0].y);
    drawDot(T[1].x,T[1].y);
    drawDot(T[2].x,T[2].y);

    // Draw 10000 Dots
    for( int i=0;i<10000;i++)
    {
        index = random(3);
        point.x = (point.x+T[index].x)/2;
        point.y = (point.y+T[index].y)/2;
        drawDot(point.x,point.y);
    }
    glFlush();       // Send all output to display   
}

// Initialization
void Init(void)    
{
    glClearColor(1.0,1.0,1.0,0.0); // Set white background color
    glColor3f(0.0f,0.0f,0.0f);    // Set the drawing color
    glPointSize(4.0);             // a 'dot' is 4 by 4 pixels
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0,640.0,0.0,480.0);
}

void main(int argc,char *argv[])
{
    glutInit(&argc, argv);  // Initialize the toolkit
    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);  // Set display mode
    glutInitWindowPosition(100, 150);  // Set window pozition on screen
    glutInitWindowSize(640, 480);      // Set window size
    glutCreateWindow("sierpinski gasket"); // Open the screen window
    glutDisplayFunc(sierpinski); // Register redraw function
    Init();
    glutMainLoop();  // Go into a perpetual loop
}