точечный график в dev c++

# include <Windows.h>
#include <math.h>
#include <gl/GL.h>
#include <gl/glut.h>
const int screenWidth = 640;
const int screenHeight=480;
GLdouble A,B,C,D;
void myInit(void)
{
    glClearColor(1.0,1.0,1.0,0.0);
    glColor3f(0.0f,0.0f,0.0f);
    glPointSize(2.0);
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0,(GLdouble)screenWidth,0.0, (GLdouble) screenHeight);
    A=screenWidth/4.0;
    B=0.0;
    C=D=screenHeight/2.0;
}
void myDisplay(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin (GL_POINTS);
    for (GLdouble x=0; x<4.0; x+=0.005)
    {
        GLdouble func=exp(-x)*cos(2*3.14159265*x);
        glVertex2d(A*x+B,C*func+D);
        glEnd();
        glFlush();
    }
}
int main (int argc, char** argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize (screenWidth, screenHeight);
    glutInitWindowPosition(100,150);
    glutCreateWindow("Dot Plot of a Fanction");
    glutDisplayFunc(myDisplay);
    myInit();
    glutMainLoop();
    return 0;
}

# include <Windows.h>
#include <math.h>
#include <gl/GL.h>
#include <gl/glut.h>
const int screenWidth = 640;
const int screenHeight=480;
GLdouble A,B,C,D;
void myInit(void)
{
        glClearColor(1.0,1.0,1.0,0.0);
        glColor3f(0.0f,0.0f,0.0f);
        glPointSize(23.0);
        glMatrixMode (GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D(0.0,(GLdouble)screenWidth,0.0, (GLdouble) screenHeight);
        A=screenWidth/4.0;
        B=0.0;
        C=D=screenHeight/2.0;
}
void myDisplay(void)
{
        glClear(GL_COLOR_BUFFER_BIT);
        glBegin (GL_POINTS);
        for (GLdouble x=0; x<4.0; x+=0.005)
        {
                GLdouble func=exp(-x)*cos(2*3.14159265*x);
                glVertex2d(A*x+B,C*func+D);
        }
                glEnd();
                glFlush();
}
int main (int argc, char** argv)
{
        glutInit(&argc,argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
        glutInitWindowSize (screenWidth, screenHeight);
        glutInitWindowPosition(100,150);
        glutCreateWindow("Dot Plot of a Fanction");
        glutDisplayFunc(myDisplay);
        myInit();
        glutMainLoop();
        return 0;
}