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  1. %{
  2. #include <stdio.h>
  3. int positive = 0, negative = 0;
  4. %}
  5.  
  6. DIGIT [0-9]
  7. SIGN [+-]
  8.  
  9. %%
  10. {SIGN}?{DIGIT}+ {
  11.     if (yytext[0] == '-') negative++;
  12.     else positive++;
  13. }
  14. .|\n ;
  15. %%
  16.  
  17. int yywrap(void) { return 1; }
  18.  
  19. int main(void) {
  20.     yylex();
  21.     printf("Positive numbers: %d\n", positive);
  22.     printf("Negative numbers: %d\n", negative);
  23.     return 0;
  24. }
Success #stdin #stdout #stderr 0.03s 6816KB
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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/I5QxKP/prog:24:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/rw4eTY
language:
Prolog (swi 7.6.4)
created:
5 days ago
visibility:
public

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