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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. "<"     { printf("It is a relational operator: <\n"); }
  7. ">"     { printf("It is a relational operator: >\n"); }
  8. "<="    { printf("It is a relational operator: <=\n"); }
  9. ">="    { printf("It is a relational operator: >=\n"); }
  10. "=="    { printf("It is a relational operator: ==\n"); }
  11. "!="    { printf("It is a relational operator: !=\n"); }
  12. .|\n    { printf("Not a relational operator: %s\n", yytext); }
  13. %%
  14.  
  15. int main() {
  16.     printf("Enter a relational operator: ");
  17.     yylex();
  18.     return 0;
  19. }
  20.  
  21. int yywrap() {
  22.     return 1;
  23. }
  24.  
Success #stdin #stdout #stderr 0.02s 6736KB
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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/8qsirQ/prog:23:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/AaqxuQ
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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