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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. 0   { 
  7.         if (yytext[0] == '0') {
  8.             if (current_state == 0) current_state = 2;
  9.             else if (current_state == 1) current_state = 3;
  10.             else if (current_state == 2) current_state = 0;
  11.             else if (current_state == 3) current_state = 1;
  12.         }
  13.     }
  14.  
  15. 1   { 
  16.         if (yytext[0] == '1') {
  17.             if (current_state == 0) current_state = 1;
  18.             else if (current_state == 1) current_state = 0;
  19.             else if (current_state == 2) current_state = 3;
  20.             else if (current_state == 3) current_state = 2;
  21.         }
  22.     }
  23.  
  24. \n  ;
  25. .   ;
  26.  
  27. %%
  28.  
  29. int current_state = 0;
  30.  
  31. int main() {
  32.     current_state = 0;  // Start state: q0
  33.  
  34.     printf("Enter a string of 0s and 1s: ");
  35.     yylex();  // Start lexing
  36.  
  37.     if (current_state == 1) {
  38.         printf("Accepted\n");
  39.     } else {
  40.         printf("Not Accepted\n");
  41.     }
  42.  
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout #stderr 0.03s 6840KB
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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/Jlw2be/prog:2:1: Syntax error: Operator expected
ERROR: /home/Jlw2be/prog:44:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/phQYIL
language:
Prolog (swi 7.6.4)
created:
8 days ago
visibility:
public

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