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  1. %{
  2. #include <stdio.h>
  3. #include <string.h>
  4. #include <ctype.h>
  5.  
  6. // Variables for part (a)
  7. int max_length = 0;
  8. char longest_word[100] = "";
  9.  
  10. // Variables for part (b)
  11. int vowels = 0, consonants = 0;
  12.  
  13. // Functions for part (c)
  14. void check_pascal_identifier(const char *str) {
  15.     printf("Pascal Identifier: %s\n", str);
  16. }
  17.  
  18. void check_unsigned_number(const char *str) {
  19.     printf("Unsigned Number: %s\n", str);
  20. }
  21. %}
  22.  
  23. %%
  24. [a-zA-Z]+   {
  25.                 // Part (a): Find the longest word
  26.                 int length = strlen(yytext);
  27.                 if (length > max_length) {
  28.                     max_length = length;
  29.                     strcpy(longest_word, yytext);
  30.                 }
  31.  
  32.                 // Part (b): Count vowels and consonants
  33.                 for (int i = 0; i < length; i++) {
  34.                     if (strchr("aeiouAEIOU", yytext[i]))
  35.                         vowels++;
  36.                     else
  37.                         consonants++;
  38.                 }
  39.             }
  40.  
  41. [0-9]+\.[0-9]+([eE][+-]?[0-9]+)?  {
  42.                 // Part (c): Match floating-point numbers with optional scientific notation
  43.                 check_unsigned_number(yytext);
  44.             }
  45.  
  46. [0-9]+       {
  47.                 // Part (c): Match integers
  48.                 check_unsigned_number(yytext);
  49.             }
  50.  
  51. [a-zA-Z_][a-zA-Z0-9_]*  {
  52.                 // Part (c): Match Pascal identifiers
  53.                 check_pascal_identifier(yytext);
  54.             }
  55.  
  56. [^a-zA-Z0-9]+   { /* Ignore non-alphanumeric characters */ }
  57.  
  58. \n|\t|\r       { /* Ignore whitespace */ }
  59.  
  60. .|\n           { /* Catch-all rule */ }
  61. %%
  62.  
  63. int main() {
  64.     printf("Enter the input string: ");
  65.     yylex();
  66.     printf("\nLongest Word: %s (Length: %d)\n", longest_word, max_length);
  67.     printf("Vowel Count: %d\n", vowels);
  68.     printf("Consonant Count: %d\n", consonants);
  69.     return 0;
  70. }
  71.  
Success #stdin #stdout #stderr 0.03s 6892KB
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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/oaZWFM/prog:70:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/uJv0J5
language:
Prolog (swi 7.6.4)
created:
352 days ago
visibility:
public

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