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  1. /* Lex code to count and list total number of tokens */
  2.  
  3. %{
  4. #include <stdio.h>
  5. #include <stdlib.h>
  6.  
  7. int n = 0;    // Counter for total tokens
  8. char* tokens[1000];   // Array to store tokens (up to 1000 tokens)
  9. int tokenIndex = 0;    // Index to store tokens
  10. %}
  11.  
  12. /* Rule Section */
  13. %%
  14.  
  15. "while"|"if"|"else" {
  16.     n++; 
  17.     printf("\tkeyword: %s\n", yytext); 
  18.     tokens[tokenIndex++] = yytext;  // Store the token
  19. }
  20.  
  21. "int"|"float" {
  22.     n++; 
  23.     printf("\tkeyword: %s\n", yytext); 
  24.     tokens[tokenIndex++] = yytext;  // Store the token
  25. }
  26.  
  27. [a-zA-Z_][a-zA-Z0-9_]* {
  28.     n++; 
  29.     printf("\tidentifier: %s\n", yytext); 
  30.     tokens[tokenIndex++] = yytext;  // Store the token
  31. }
  32.  
  33. "<="|"=="|"="|"++"|"-"|"*"|"+" {
  34.     n++; 
  35.     printf("\toperator: %s\n", yytext); 
  36.     tokens[tokenIndex++] = yytext;  // Store the token
  37. }
  38.  
  39. [(){}|,;] {
  40.     n++; 
  41.     printf("\tseparator: %s\n", yytext); 
  42.     tokens[tokenIndex++] = yytext;  // Store the token
  43. }
  44.  
  45. [0-9]*"."[0-9]+ {
  46.     n++; 
  47.     printf("\tfloat: %s\n", yytext); 
  48.     tokens[tokenIndex++] = yytext;  // Store the token
  49. }
  50.  
  51. [0-9]+ {
  52.     n++; 
  53.     printf("\tinteger: %s\n", yytext); 
  54.     tokens[tokenIndex++] = yytext;  // Store the token
  55. }
  56.  
  57. . ;  // Ignore unrecognized characters
  58.  
  59. %%
  60.  
  61. /* Main function */
  62. int main() {
  63.     yylex();   // Start lexical analysis
  64.  
  65.     printf("\nTotal number of tokens = %d\n", n);  // Print total token count
  66.  
  67.     // Print the list of tokens
  68.     printf("\nList of tokens:\n");
  69.     for (int i = 0; i < tokenIndex; i++) {
  70.         printf("%s\n", tokens[i]);  // Print each token
  71.     }
  72.  
  73.     return 0;
  74. }
  75.  
Success #stdin #stdout #stderr 0.04s 6952KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/f0aVhO/prog:4:1: Syntax error: Operator expected
ERROR: /home/f0aVhO/prog:74:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/50QX2D
language:
Prolog (swi 7.6.4)
created:
10 days ago
visibility:
public

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