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  1. /*Lex program to count the number of vowels & consonants from the given input string.*/
  2. %{
  3. 	#include<stdio.h>
  4. 	int vow=0, con=0;
  5. %}
  6.  
  7. %%
  8. [ \t\n]+    ;
  9. [aeiouAEIOU]+    {vow++;}
  10. [^aeiouAEIOU]    {con++;}
  11. %%
  12.  
  13. int main( )
  14. {
  15. 	printf("Enter some input string:\n");
  16. 	yylex();
  17. 	printf("Number of vowels=%d\n",vow);
  18. 	printf("Number of consonants=%d\n",con);
  19. }
  20.  
  21. int yywrap( )
  22. {
  23. 	return 1;
  24. }
  25.  
  26.  
Success #stdin #stdout #stderr 0.03s 6948KB
comments (?)
stdin
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hello world 
he is
stdout
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Standard output is empty
stderr
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ERROR: /home/6C6ulP/prog:25:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? Options:
+:                  spy        -:              no spy
/c|e|r|f|u|a goal:  find       .:              repeat find
a:                  abort      A:              alternatives
b:                  break      c (ret, space): creep
[depth] d:          depth      e:              exit
f:                  fail       [ndepth] g:     goals (backtrace)
h (?):              help       i:              ignore
l:                  leap       L:              listing
n:                  no debug   p:              print
r:                  retry      s:              skip
u:                  up         w:              write
m:                  exception details
C:                  toggle show context
   Exception: (3) program ? EOF: exit
https://ideone.com/bM3Adn
language:
Prolog (swi 7.6.4)
created:
1 day ago
visibility:
public

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