cal.l

lex files for given decription used as assignment in compiler design

%{

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <math.h>
#define YYSTYPE double

#include "y.tab.h"


extern YYSTYPE yylval;



%}



digit [0-9]

space [ \t]



%%

{space}         { ; }    /* spaces are ignored */



{digit}+\.?|{digit}*\.{digit}+ { 

                   yylval = strtod(yytext,0); 

                   return NUMBER; }



\*\*            { return '^';  }

cos             { return COS;  }

exp             { return EXP;  }

sin             { return SIN;  }

sqrt            { return SQRT; }

tan             { return TAN;  }



\n              { return '\n'; }



.               { return yytext[0]; }



%%