 6.    

        ,     .     ,   .

         ,      .
          ,      const.   :
const    =  ;
 :
const float pi=3,14;
float   ,    .
  ++           .        math.h.
 M_PI =  , M_PI_2 =    , M_PI_4 =   4, M_1_PI = 1   , M_1_SQTRTPI = 1       .
 ,       .        ,    cin >>,     .    . :
int q, w, e, r, t, y;
float u, i, o, p, a = 45; 