 3. 

    ,      .   ++     # (sharp).      .
 #include.   ,            .         ,       .           :
#include 

 :
#include   \ . 
       INCLUDE     :
#include
   ,  -       .     :
#include [1]D:\C++\vrednyi.h[1]

    #define.    .        .    ,       18071994,     .    .
#define A 18071994
             18071994.    ?          (- ). :
#define p(a, b) (a*b)
   p=a*b     .     ,    -     ?      ?   
    ,     .     #define     #undef.            ,      .