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  1. %{
  2. #include<stdio.h>
  3. %}
  4. %%
  5. ^[a-zA-Z_][a-zA-Z0-9]*
  6. {
  7. printf("vaild identifier");
  8. }
  9. ^[^a-zA-Z_]
  10. .;
  11. {printf("invaild identifier");
  12. }
  13. int yywrap()
  14. {
  15. return 1;
  16. }
  17. int main()
  18. {
  19. 	printf("enter the expression")
  20. 	yylex();
  21. }
Success #stdin #stdout #stderr 0.03s 6836KB
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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/Kyk1dd/prog:21:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/SknNZo
language:
Prolog (swi 7.6.4)
created:
1 day ago
visibility:
public

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