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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. /* Define a simple yywrap if needed (some Flex versions require it) */
  6. int yywrap(void) {
  7.     return 1;
  8. }
  9.  
  10. %%
  11. [0-9]+    { printf("%s\n", yytext); }  /* Print any sequence of one or more digits */
  12. .|\n      { /* Ignore any other characters */ }
  13. %%
  14.  
  15. int main(int argc, char **argv) {
  16.     yylex();
  17.     return 0;
  18. }
  19.  
Success #stdin #stdout #stderr 0.02s 6924KB
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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/YkzB8z/prog:18:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/R3HM7k
language:
Prolog (swi 7.6.4)
created:
10 days ago
visibility:
public

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