display two spheres?

gistfile1.txt

void display()
{
    
    //  Clear the previous frame
    glClear(GL_COLOR_BUFFER_BIT);
    {
        
        glPushMatrix();
        glTranslatef(0.5, 0.5, 0);
        glutWireSphere(0.2, 0.2, 10);
        glPopMatrix();
        
        glPushMatrix();
        glTranslatef(0.5, 0.6, 0);
        glutSolidSphere(0.1, 0.1, 10);
        glPopMatrix();

    }
    glEnd();                //  Finish adding vertices
    
    //  Flush the buffers to the screen
    glFlush();
}