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  1. %{
  2.   #include<stdio.h>
  3.   #include<stdlib.h>
  4.   #include<string.h>
  5.   #define MAX_IDENTIFIER_LENGTH 50
  6. %}
  7. %option noyywrap
  8. %option yylineo
  9. void addto symboltable(const char*)
  10. %%
  11. [\t]
  12. /n/
  13. \n*([^*]|\*+[^*/])*
  14. [0-9]+{printf("constant:%s\n*,yytext");}
  15. ={printf("%s is an assignment operator\n",yytext);}
  16. \*/
  17. \+/
  18. \-{printf("%s is a operator\n",yytext);}
  19. [a-ZA-Z][a-ZA-Z0-9]*{printf("identifier:%s\n",yytext);addsymboltable(yytext);}
  20.    {printf("Invalid token:%s\n",yytext);}
  21.    %%
  22.    typedef struct
  23.    {
  24.      charname[MAX_IDENTIFIER_LENGTH];
  25.    }symbol;
  26.     symbol symbol_table[100];
  27.     int symbol_count=0;
  28.   void addtosymboltable(const char*identifier){
  29.     if(symbol_count<100)
  30.     {
  31.     strncpy(symbol_table(symbol_count].name,identifier,MAX_IDENTIFIER_LENGTH-1);
  32.     symbol_table[symbol_count].name[MAX_IDENTIFIER_LENGTH-1]='\0';
  33.     symbol_count++;
  34.     printf("Identifier %s is entered in the symbol table",idnetifier);
  35.     }
  36.     else
  37.     {
  38.       printf("symbol table is full.cannot add more identifier.\n");
  39.       exit(0);
  40.     }
  41.   }
  42.   int main()
  43.   {
  44.     yylex();
  45.     return 1;
  46.  
Success #stdin #stdout #stderr 0.03s 6980KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/0YbrVB/prog:46:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/bkR5Hb
language:
Prolog (swi 7.6.4)
created:
3 days ago
visibility:
public

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