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  1. Code: 
  2. %{ 
  3. #include <stdio.h> 
  4. %} 
  5.  
  6. %% 
  7.  
  8. [a-zA-Z_][a-zA-Z0-9_]* { printf("Valid Identifier: %s\n", yytext); } 
  9. .|\n { /* Ignore all other characters */ } 
  10.  
  11. %% 
  12.  
  13. int main() { 
  14. printf("Enter input (Ctrl+D to end):\n"); 
  15. yylex(); 
  16. return 0; 
  17. } 
  18.  
  19. int yywrap() { 
  20. return 1; 
  21. }
Success #stdin #stdout #stderr 0.02s 6896KB
comments (?)
stdin
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int count=2
stdout
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Standard output is empty
stderr
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ERROR: /home/luinb2/prog:21:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/8ontRV
language:
Prolog (swi 7.6.4)
created:
7 days ago
visibility:
public

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