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  1. %{
  2. int pos = 0, neg = 0;
  3. %}
  4.  
  5. %%
  6.  
  7. [+]?[0-9]+ {
  8.     if (yytext[0] == '+') {
  9.         pos++;
  10.     } else {
  11.         pos++;
  12.     }
  13. }
  14. [-]?[0-9]+ {
  15.     if (yytext[0] == '-') {
  16.         neg++;
  17.     } else {
  18.         pos++;
  19.     }
  20. }
  21.  
  22. %%
  23.  
  24. int main() {
  25.     yylex();
  26.     printf("Positive integers: %d\nNegative integers: %d\n", pos, neg);
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout #stderr 0.02s 6852KB
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Standard input is empty
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Standard output is empty
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ERROR: /home/qPZzaO/prog:28:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/tTxTmB
language:
Prolog (swi 7.6.4)
created:
1 year ago
visibility:
public

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