         -
    curcol:

#define NEXTTAB (curcol) (TABSIZE - ((curcol) % TABSIZE))

     TABSIZE,   -
   NEXTTAB   .  NEXTTAB   
tabs.      retval   findstop:

retval = NEXTTAB (*col);

      , 
     ,   
(header file)    (include file).     
    ,      .h.
        #include  -
   ,       . -
  . 27.1   getchar  putchar,   
stdio.h.   stdio.h     -
      .

  (<  >),     stdio.h  tabs. ,  -
 ,          (-
  /usr/include).        ,
     .       -
 ,    .      -
         ,  
      .   
,  ,    .

          -
  -I  . ,    -
  deriv. ,     :

#include "eqns.h"

   eqns.h    myincludes,  
  deriv.    -I,    -
  eqns. h   :

$ gcc -I./myincludes deriv.

         deriv.  -
 ^include,    eqns.h   myincludes  .

     .  -
          -
     .   -
    ,     
   .      
-I    gcc,     .

   main     ,
  ,    ,   
     .   tabs.   findstop -
 ,   findstop   int     -

826                                                 VI. 