Thread: What's wrong with this( if not everything )?

I use glut, but I don't see a glMatrixMode, glLoadIdentity, and I don't know if you need to create a window like in glut. But that is what I see. example code in glut to compare

Code:

#include <GL/gl.h>
#include <GL/glut.h>

void init(void){
     glClearColor(0.0,0.0,0.0,0.0);
     glShadeModel(GL_FLAT);
}

void display(void){
     glClear(GL_COLOR_BUFFER_BIT);
     glColor3f(0.0,0.0,1.0);
     glBegin(GL_POLYGON);
          glVertex3f(0.25,0.25,0.0);
          glVertex3f(0.75,0.25,0.0);
          glVertex3f(0.75,0.75,0.0);
          glVertex3f(0.25,0.75,0.0);
     glEnd();
     glFlush();
}

int main(int argc,char **argv){
     glutInit(&argc,argv);
     glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE);
     glutInitWindowSize(250,250);
     glutInitWindowPosition(100,100);
     glutCreateWindow("Hey");
     init();
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     glOrtho(0.0,1.0,0.0,1.0,-1.0,0.0);
     glutDisplayFunc(display);
     glutMainLoop();
     return 0;
}