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  1. %{
  2. 	#include <stdio.h>
  3. 	int yylex()
  4. 	int yyerror(char *s)
  5.  
  6. %}
  7. %token ALPHA DIGIT
  8. %%
  9. var:ALPHA
  10.    |ALPHA
  11.    |DIGIT
  12.    ;
  13. %%
  14. int main()
  15. {
  16. 	printf("enter the name of variables\n");
  17.     yyparse();
  18.     printf("valid variable");
  19. 	return 0;
  20. }
  21.  
  22. int yyerror(char *s)
  23. {
  24.   printf("invalid variable")
  25.   return 1;
  26. }
Success #stdin #stdout #stderr 0.02s 3188KB
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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/run-20086/prog:26:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/EAsHYH
language:
Prolog (swi 7.6.4)
created:
19 hours ago
visibility:
public

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