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  1. %{
  2.     #include <stdio.h>
  3.     int count = 0;
  4. %}
  5.  
  6. %%
  7.  
  8. [ \t]   { count++; }   // Count spaces and tabs
  9. .       { }           // Ignore other characters
  10. \n      { return 0; } // Stop processing on newline
  11.  
  12. %%
  13.  
  14. int yywrap() {
  15.     return 1;
  16. }
  17.  
  18. int main() {
  19.     printf("Enter text:\n");
  20.     yylex();
  21.     printf("Number of spaces and tabs: %d\n", count);
  22.     return 0;
  23. }
  24.  
Success #stdin #stdout #stderr 0.03s 6904KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/K64Dcs/prog:2:5: Syntax error: Operator expected
ERROR: /home/K64Dcs/prog:23:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/bn7nZH
language:
Prolog (swi 7.6.4)
created:
12 days ago
visibility:
public

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