fork download
copy 
  1. %{
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. // List of C language keywords
  6. char *keywords[] = {
  7.     "auto", "double", "int", "struct", "break", "else", "long", "switch",
  8.     "case", "enum", "register", "typedef", "char", "extern", "return", "union",
  9.     "continue", "for", "signed", "void", "do", "if", "static", "while",
  10.     "default", "goto", "sizeof", "volatile", "const", "float", "short", "unsigned",
  11.     NULL
  12. };
  13.  
  14. // Function to check if a token is a keyword
  15. int is_keyword(char *s) {
  16.     for (int i = 0; keywords[i]; i++) {
  17.         if (strcmp(s, keywords[i]) == 0)
  18.             return 1;
  19.     }
  20.     return 0;
  21. }
  22. %}
  23.  
  24. %%
  25.  
  26. // Match valid identifiers (starting with letter or underscore)
  27. [a-zA-Z_][a-zA-Z0-9_]* {
  28.     if (is_keyword(yytext))
  29.         printf("Keyword: %s\n", yytext);
  30.     else
  31.         printf("Identifier: %s\n", yytext);
  32. }
  33.  
  34. // Match integers (not valid identifiers)
  35. [0-9]+ {
  36.     printf("Not an Identifier: %s\n", yytext);
  37. }
  38.  
  39. // Ignore any other characters (punctuation, whitespace, etc.)
  40. .|\n {
  41.     // do nothing (skip)
  42. }
  43.  
  44. %%
  45.  
  46. // Required function
  47. int yywrap() {
  48.     return 1;
  49. }
  50.  
  51. // Main driver function
  52. int main(void) {
  53.     yylex();
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout #stderr 0.03s 6784KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
stderr
copy 
ERROR: /home/ls29Ai/prog:55:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/dtg0m2
language:
Prolog (swi 7.6.4)
created:
4 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!