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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. letter  [a-zA-Z_]
  6. digit   [0-9]
  7.  
  8. %%
  9.  
  10. {letter}({letter}|{digit})*   { printf("%s is an identifier\n", yytext); }
  11. {digit}({letter}|{digit})*   { printf("%s is not an identifier\n", yytext); }
  12. .                             { printf("%s is not an identifier\n", yytext); }
  13.  
  14. %%
  15.  
  16. int main() {
  17.     yylex();
  18.     return 0;
  19. }
Success #stdin #stdout #stderr 0.02s 7004KB
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stdin
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1
2
10
42
11
stdout
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Standard output is empty
stderr
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ERROR: /home/asyrOl/prog:2:1: Syntax error: Operator expected
ERROR: /home/asyrOl/prog:19:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/CsuCy8
language:
Prolog (swi 7.6.4)
created:
2 hours ago
visibility:
public

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