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  1. lex 1
  2. %{
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5.  
  6. // Declare the state variable globally
  7. int state = 0;  // Start state q0
  8. %}
  9.  
  10. %%
  11.  
  12. 0     { 
  13.         if (state == 0) state = 1;  // From q0 to q1 on '0'
  14.         else if (state == 1) state = 0;  // From q1 to q0 on '0'
  15.         else if (state == 2) state = 3;  // From q2 to q3 on '0'
  16.         else if (state == 3) state = 2;  // From q3 to q2 on '0'
  17.       }
  18.  
  19. 1     { 
  20.         if (state == 0) state = 3;  // From q0 to q3 on '1'
  21.         else if (state == 1) state = 2;  // From q1 to q2 on '1'
  22.         else if (state == 2) state = 1;  // From q2 to q1 on '1'
  23.         else if (state == 3) state = 0;  // From q3 to q0 on '1'
  24.       }
  25.  
  26. \n    { /* Ignore newline characters */
  27.         return 0;
  28.       }
  29.  
  30. .     { /* Ignore any other character */
  31.         return 0;
  32.       }
  33.  
  34. %%
  35.  
  36. int main(void) {
  37.     // Start the lexer
  38.     yylex();
  39.  
  40.     // Check final state for acceptance
  41.     if (state == 3) {
  42.         printf("Accepted: Odd number of 1’s and even number of 0’s\n");
  43.     } else {
  44.         printf("Rejected\n");
  45.     }
  46.  
  47.     return 0;
  48. }
  49.  
  50.  
Success #stdin #stdout #stderr 0.02s 6964KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/7uMhXf/prog:1:4: Syntax error: Operator expected
ERROR: /home/7uMhXf/prog:49:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/mmyEXD
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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