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  1. %{
  2.   #include<stdio.h>;
  3. %}
  4. %%
  5. if|else|while|for|switch|int|char {printf("keyword");}
  6. [a-z]([a-z][0-9])* {printf("id");}
  7. [0-9]* {printf("number");}
  8. .* {printf("invalid");}
  9. %%
  10. main(){
  11.   yylex();
  12.   return 0;
  13. }
  14. int yywrap()
  15. {
  16. }
Success #stdin #stdout #stderr 0.02s 6968KB
comments (?)
stdin
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gfg : valid identifier
123 : invalid identifier
_abc12 : valid identifier
#abc : invalid identifier
stdout
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Standard output is empty
stderr
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ERROR: /home/ng4igs/prog:16:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ?       [3] program
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? EOF: exit
https://ideone.com/XghMB3
language:
Prolog (swi 7.6.4)
created:
5 days ago
visibility:
public

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