openGL window crash

i am working on openGL in Vc6 every time i run the following simple code output window crashes

#include <stdio.h>
#include <gl/glut.h>
//#include <gl/glaux.h>

void display(void)
{

    glColor3f(255.0f,255.0f,255.0f);
    glBegin(GL_QUADS);
    glVertex3f(0.0f,0.0f,0.0f);
    glVertex3f(0.0f,5.0f,0.0f);
    glVertex3f(5.0f,5.0f,0.0f);
    glVertex3f(5.0f,0.0f,0.0f开发者_Python百科);
    glVertex3f(0.0f,0.0f,0.0f);
    glEnd();
    glFlush();
}

 void init(void)
 {
        glViewport(0,0,400,400);
       glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0,4/3,4.0,1000.0);
    glMatrixMode(GL_MODELVIEW);
    gluLookAt(2.0,2.0,2.0,1.0,2.0,1.0,0.0,1.0,0.0);
 }

int main(int argc, char *argv[])
{
    glutInit(&argc,argv);
    init();
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);
    glutInitWindowPosition(400,400);
    glutInitWindowSize(400,400);
    glutCreateWindow("Trial");
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;

}

i don't know what is going wrong any boby please help

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You are using OpenGL functions before you have an OpenGL context (which is a requirement to call any GL functions at all). The context is created by glutCreateWindow, but your first call to GL functions happens in init(). To fix this, you could move your init() call right below the glutCreateWindow call.