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  1. /*lex program to find the length of a string*/
  2.  
  3. %{ 
  4. #include<stdio.h> 
  5. int length; 
  6. %} 
  7.  
  8. /* Rules Section*/
  9. %% 
  10. [a-z A-Z 0-9]+ {length=yyleng; } 
  11. %% 
  12.  
  13. int main() 
  14. { 
  15. yylex(); 
  16. printf("length of given string is : %d", length); 
  17. return 0; 
  18. } 
  19.  
Success #stdin #stdout #stderr 0.02s 6768KB
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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/niK4Hy/prog:18:2: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/gV0eER
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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