preprocessor

he Asir user language imitates C language. A typical features of C language include macro expansion and file inclusion by the preprocessor cpp. Also, Asir read in user program files through cpp. This enables Asir user to use #include, #define, #if etc. in his programs.

• #include
  Include files are searched within the same directory as the file containing #include so that no arguments are passed to cpp.
• #define
  This can be used just as in C language.
• #if
  This is conveniently used to comment out a large part of a user program that may contain comments by /* and */, because such comments cannot be nested.

the following are the macro definitions in `defs.h'.

#define ZERO 0
#define NUM 1
#define POLY 2
#define RAT 3
#define LIST 4 
#define VECT 5
#define MAT 6
#define STR 7
#define N_Q 0
#define N_R 1
#define N_A 2
#define N_B 3
#define N_C 4
#define V_IND 0
#define V_UC 1
#define V_PF 2
#define V_SR 3
#define isnum(a) (type(a)==NUM)
#define ispoly(a) (type(a)==POLY)
#define israt(a) (type(a)==RAT)
#define islist(a) (type(a)==LIST)
#define isvect(a) (type(a)==VECT)
#define ismat(a) (type(a)==MAT)
#define isstr(a) (type(a)==STR)
#define FIRST(L) (car(L))
#define SECOND(L) (car(cdr(L)))
#define THIRD(L) (car(cdr(cdr(L))))
#define FOURTH(L) (car(cdr(cdr(cdr(L)))))
#define DEG(a) deg(a,var(a))
#define LCOEF(a) coef(a,deg(a,var(a)))
#define LTERM(a) coef(a,deg(a,var(a)))*var(a)^deg(a,var(a))
#define TT(a) car(car(a))
#define TS(a) car(cdr(car(a)))
#define MAX(a,b) ((a)>(b)?(a):(b))

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