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  1. digit [0-9] 
  2. %{ 
  3. int cons=0; 
  4. %} 
  5. %% 
  6. {digit}+ { cons++; printf("%s is a constant\n", yytext);  } 
  7. .|\n { } 
  8. %% 
  9. int yywrap(void) { 
  10. return 1; } 
  11. int main(void) 
  12. { 
  13. FILE *f; 
  14. char file[10]; 
  15. printf("Enter File Name : "); 
  16. scanf("%s",file); 
  17. f = fopen(file,"r"); 
  18. yyin = f; 
  19. yylex(); 
  20. printf("Number of Constants : %d\n", cons); 
  21. fclose(yyin);   
  22. }
Success #stdin #stdout #stderr 0.02s 6940KB
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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/ctZHqz/prog:22:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/BrFOSN
language:
Prolog (swi 7.6.4)
created:
10 days ago
visibility:
public

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