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  1. %{
  2. #include <stdio.h>
  3. int letters = 0, digits = 0, special = 0;
  4. %}
  5.  
  6. %%
  7. [a-zA-Z]        { letters++; }
  8. [0-9]           { digits++; }
  9. [^a-zA-Z0-9\n]  { special++; }
  10. %%
  11. int main() {
  12.     yylex();
  13.     printf("Letters: %d\n", letters);
  14.     printf("Digits: %d\n", digits);
  15.     printf("Special characters: %d\n", special);
  16.     return 0;
  17. }
Success #stdin #stdout #stderr 0.02s 6872KB
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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/6qhhoR/prog:17:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/kYlFR4
language:
Prolog (swi 7.6.4)
created:
17 hours ago
visibility:
public

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