#class extern arc(double,double,double,double,double,double,double); extern circ(double,double,double); extern box(double,double,double,double); extern sbox(double,double,double,double); extern mov(double,double); extern rmov(double,double); extern point(double,double); extern vec(double,double); extern rvec(double,double); extern line(double,double,double,double); extern range(double,double,double,double); extern frame(double,double,double,double); extern grade(double); extern color(char *); extern cfill(char *); extern pen(char *); extern text(char *);