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  1. %{
  2.  #include<stdio.h>
  3. #include<ctype.h>
  4.  
  5. int a=0;
  6. %}
  7. %%
  8.  
  9. [a-zA-Z_][a-zA-Z0-9_]*  {
  10. 	printf("Valid identifier : %s\n",yytext);
  11. 	a++;
  12. 	}
  13. "="           {printf ("Assignment operator found \n");}
  14. .              {printf ("invalid character :%s\n",yytext);}
  15. %%
  16. int main(){
  17.  yylex();
  18. printf("Total valid identifiers found :%d\n",a);
  19. return 0;
  20. }
  21.  
  22. int yywrap(void){
  23. return 1;
  24. }
Success #stdin #stdout #stderr 0.03s 6900KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/rFd9WJ/prog:2:2: Syntax error: Operator expected
ERROR: /home/rFd9WJ/prog:24:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/r4hDNr
language:
Prolog (swi 7.6.4)
created:
11 days ago
visibility:
public

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