                                        ______________67

for (sum =i=0, j =2, k=i+j; i<10 II k < 15;

++i, ++j, ++k)
sum += (i < j ) ? k : i;

21. ()       -   -
  FILE   ,   stdio.h.  C++ -
 /stream, h,     D, -.  
       5  . 63 , -
    fstream.h.     
 :

gcd gcd.dak gcd.ans

22.        
ASCII.     ,   IBM
EBCDIC.    ctype.h,   
      .  -
 10  . 64  11  . 65,  ctype.h (.  D.7,  
  ctype.h,  . 416). ,  ,    
 ,   :

else if (isdigit())
++digit_cnt ;

23.      ,  -
   :

int i = 3, *j = &i;

bool flag = true;

double x = 1.5;

         (int) 
 (double). ,   -,  

static_cast<>.

24.      .  , -
          -
  .

cin  piece    //p n b r q k ( 
//  )