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  1. %{
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. %}
  6.  
  7. %%
  8.  
  9. [a-zA-Z]+   {
  10.  
  11.                 strcpy(num, yytext);  
  12.                 len = strlen(num);  
  13.                 int flag = 1; 
  14.  
  15.  
  16.                 for (int i = 0; i < len / 2; i++) 
  17.                 {
  18.                     if (num[i] != num[len - 1 - i])
  19.                     {
  20.                         flag = 0;  
  21.                         break;
  22.                     }
  23.                 }
  24.  
  25.                 if (flag=1) 
  26.                 {
  27.                     printf("\"%s\" is a palindrome.\n", num);
  28.                 } else
  29.                 {
  30.                     printf("\"%s\" is not a palindrome.\n", num);
  31.                 }
  32.             }
  33.  
  34. [ \t\n]+  ; 
  35.  
  36. %%
  37.  
  38. int main() {
  39.     printf("Enter a string to check for palindrome:\n");
  40.     yylex();  
  41.     return 0;
  42. }
  43.  
  44.  
Success #stdin #stdout #stderr 0.03s 6924KB
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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/Iaefh6/prog:43:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/RR9LoW
language:
Prolog (swi 7.6.4)
created:
5 days ago
visibility:
public

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