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  1. %{
  2. #include <stdio.h>
  3. int flag=0;
  4. %}
  5.  
  6. %%
  7. [^a-zA-Z\n] { flag=1; }
  8. .|\n ;
  9. %%
  10.  
  11. int yywrap(){ return 1; }
  12.  
  13. int main(){
  14.     printf("Enter a string: ");
  15.     yylex();
  16.     if(flag)
  17.         printf("String contains non-alphabet characters.\n");
  18.     else
  19.         printf("String contains only alphabets.\n");
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout #stderr 0.03s 6932KB
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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/zRKbIg/prog:21:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/Y65RTs
language:
Prolog (swi 7.6.4)
created:
6 days ago
visibility:
public

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