very simple opengl viewer

#include <GL/glut.h>
//Drawing funciton
void draw(void)
{
//Background color
    glClearColor(0,1,0,1);
    glClear(GL_COLOR_BUFFER_BIT );
//Draw order
    glFlush();
}
//Main program
int main(int argc, char **argv)
{
    glutInit(&argc, argv);
//Simple buffer
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB );
    glutInitWindowPosition(50,25);
    glutInitWindowSize(500,250);
    glutCreateWindow("Green window");
//Call to the drawing function
    glutDisplayFunc(draw);
    glutMainLoop();
    return 0;
}