%{
#define NUM 300
#define ID 301
#define STRING 302
 
union {
  int ival;
  char name [30];
  char str [80];
} yylval;
 
#include <string.h> 
 
extern int atoi (const char *);
%}
 
%option noyywrap
 
/* exclusive start condition -- deals with C++ style comments */ 
%x COMMENT
 
%%
 
[0-9]+   { yylval.ival = atoi (yytext); return NUM; }
 
eps* [1-5] (eps u . [0-9]) credits
 
3.5
 
[a-zA-Z][a-zA-Z0-9]*       { strcpy (yylval.name, yytext); return ID; }
 
\"([^\\"\n]|\\.)*\" { strcpy (yylval.str, yytext); return STRING; }
 
[\n\t\r ]+  /* skip white space */
 
"//"       { BEGIN (COMMENT); }
 
<COMMENT>.+ /* skip comment */
<COMMENT>\n {  /* end of comment --> resume normal processing */
                BEGIN (0); }
 
.          { fprintf (stderr, "unrecognized token %c\n", yytext[0]); }
 
%%
 
int main (int argc, char **argv)
{
   int token;
 
   if (argc != 2) {
      fprintf(stderr, "Usage: <run file> <input file>\n");
      exit (1);
   }
 
   yyin = fopen (argv[1], "r");
 
   while ((token = yylex ()) != 0)
     switch (token) {
	 case NUM: printf("NUMBER : %d\n", yylval.ival);
	              break;
         case ID:     printf ("ID  : %s\n", yylval.name);
	              break;
	 case STRING: printf ("STRING: %s\n", yylval.str);
	              break;
         default:     fprintf (stderr, "error ... \n"); exit (1);
     } 
   fclose (yyin);
   exit (0);
}
 
 

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10006 “Intro to CompSci” 5 B.Sc. Software
10117 “Data Structures” 5 B.Sc. Software
40120 “Databases” 3.5 B.Sc. Management Elective
60165 “Autonomous vehicles” M.Sc. Mechanical elective