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  1. /*lex program to count number of words*/
  2. %{
  3. #include<stdio.h>
  4. #include<string.h>
  5. int i = 0;
  6. %}
  7.  
  8. /* Rules Section*/
  9. %%
  10. ([a-zA-Z0-9])* {i++;} /* Rule for counting
  11. number of words*/
  12.  
  13. "\n" {printf("%d\n", i); i = 0;}
  14. %%
  15.  
  16. int yywrap(void){}
  17.  
  18. int main()
  19. {
  20. // The function that starts the analysis
  21. yylex();
  22.  
  23. return 0;
  24. }
  25.  
  26.  
Success #stdin #stdout #stderr 0.03s 6940KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
ERROR: /home/KW4f03/prog:25:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit