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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. [0-9]+      { printf("%s\n", yytext); }
  7. .|\n        { /* ignore everything else */ }
  8. %%
  9.  
  10. int main(int argc, char *argv[])
  11. {
  12.     if (argc < 2)
  13.     {
  14.         printf("Usage: %s <filename>\n", argv[0]);
  15.         return 1;
  16.     }
  17.  
  18.     FILE *fp = fopen(argv[1], "r");
  19.  
  20.     if (fp == NULL)
  21.     {
  22.         printf("Cannot open file\n");
  23.         return 1;
  24.     }
  25.  
  26.     yyin = fp;
  27.     yylex();
  28.  
  29.     fclose(fp);
  30.     return 0;
  31. }}
Success #stdin #stdout #stderr 0.02s 6872KB
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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/XgXRZr/prog:31:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/rkyaCm
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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