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  1.  
  2. /* Lex program to check whether input is digit or not. */
  3. %{ 
  4. #include<stdio.h> 
  5. #include<stdlib.h> 
  6. %} 
  7. /* Rule Section */
  8. %% 
  9.  
  10. ^[0-9]*  printf("digit"); 
  11.  
  12. ^[^0-9]|[0-9]*[a-zA-Z]  printf("not a digit"); 
  13. . ; 
  14. %% 
  15.  
  16. int main() 
  17. { 
  18.  
  19.         // The function that starts the analysis 
  20.  
  21.     yylex(); 
  22.  
  23.         return 0; 
  24. }
Success #stdin #stdout #stderr 0.02s 6896KB
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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/fTG5Sa/prog:4:1: Syntax error: Operator expected
ERROR: /home/fTG5Sa/prog:24:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/S8gVZn
language:
Prolog (swi 7.6.4)
created:
2 years ago
visibility:
public

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