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  1. %{
  2.  #include<stdio.h>
  3.  #include<stdlib.h>
  4.  
  5.  FILE*yyin;
  6. %}
  7.  
  8. digit [0-9]
  9. number {digit}+(\.{digit}*)?
  10. %%
  11.  
  12. {number} {printf("%s\n",yytext);}
  13. [\t\n]+ ; 
  14. . ;
  15. %%
  16.  
  17. int main(int argc, char*argv[])
  18. {
  19.   if(argc<2)
  20.   {
  21.     printf("Usage:%<file>\n",argv[0]);
  22.     return 1;
  23.   }
  24.   yyin = fopen(argv[1],"r");
  25.   if(!yyin)
  26.   {
  27.     perror("file not open");
  28.     return 1;
  29.   }
  30.   yylex();
  31.   fclose(yyin);
  32.   return 0;
  33. }
Success #stdin #stdout #stderr 0.02s 6908KB
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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/BABghk/prog:2:2: Syntax error: Operator expected
ERROR: /home/BABghk/prog:33:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/XU9vbF
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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