double func_atof(char *p){
	double	 integer = 0.0, div = 1.0 , fract = 0.0 , sign = 1.0;
   if(   *p == 45  ){sign = -1.0, *p++ ; }
	while ( isdigit(*p)  ) { 
		integer = ( *p++ )  +  (10.0   *   integer)  -  48.0 ; 
		}
	if(*p == 46  ){
	(*p++ ) ;
	while (  isdigit(*p) )  {
		fract = ( *p++ )  +  (10.0   *   fract)  -  48.0  ; 
		div *= 10;		
		}
    }
  return    (integer  +   fract  / div )  * sign    ;
}