Draw a picture using line:

void main(void)

{

    int   driver = DETECT,mode;

    int   x[10],y[10];

    int   x_center = 360, y_center = 180, rad = 100;

    int   i,j;

    initgraph(&driver,&mode,"c:\\tc\\bgi");

    for ( i = 0; i < 10; i++ )

    {

       x[i] =  x_center + rad *  cos(36*i*3.14159/180);

       y[i] =  y_center + rad *  sin(36*i*3.14159/180);

    }

    for ( i = 0; i < 10; i++ )

       for ( j = 0; j < 10; j++ )

                  line(x[i],y[i],x[j],y[j]);

    getch();           /* press any key return to TEXT mode */

    closegraph();

}