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  1. %{
  2. #include <stdio.h>
  3. int line_number = 1;
  4. %}
  5. %option noyywrap
  6. %%
  7. \n          { printf("%d: ", line_number++); ECHO; }
  8. .           { ECHO; }
  9. %%
  10. int main() {
  11.    FILE *file = fopen("lines.txt","r");
  12.    if (!file){
  13.        printf("ERROR");
  14.        return 1;
  15.    }
  16.    yyin=file;
  17.    yylex();
  18.    fclose(file);
  19.    return 0;
  20. }
Success #stdin #stdout #stderr 0.03s 6920KB
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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/SDJiRM/prog:2:1: Syntax error: Operator expected
ERROR: /home/SDJiRM/prog:20:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/Olf7bN
language:
Prolog (swi 7.6.4)
created:
10 days ago
visibility:
public

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