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  1. %{
  2. /* Program to recognize a C program */
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5. int COMMENT = 0;
  6. int cnt = 0;
  7. %}
  8.  
  9. identifier [a-zA-Z][a-zA-Z0-9]*
  10.  
  11. %%
  12. #.* { printf("\n%s is a PREPROCESSOR DIRECTIVE", yytext); }
  13. int|float|char|double|while|for|do|if|break|continue|void|switch|case|long|struct|const|typedef|return|else|goto 
  14.     { printf("\n\t%s is a KEYWORD", yytext); }
  15. \/\* { COMMENT = 1; }
  16. \*\/ { COMMENT = 0; cnt++; }
  17. {identifier}\( { if (!COMMENT) printf("\n\nFUNCTION\n\t%s", yytext); }
  18. \\{ { if (!COMMENT) printf("\nBLOCK BEGINS"); }
  19. \\} { if (!COMMENT) printf("\nBLOCK ENDS"); }
  20. {identifier}(\[[0-9]*\])? { if (!COMMENT) printf("\n%s IDENTIFIER", yytext); }
  21. \".*\" { if (!COMMENT) printf("\n\t%s is a STRING", yytext); }
  22. [0-9]+ { if (!COMMENT) printf("\n\t%s is a NUMBER", yytext); }
  23. \)(\;)? { if (!COMMENT) printf("\n\t"); ECHO; printf("\n"); }
  24. = { if (!COMMENT) printf("\n\t%s is an ASSIGNMENT OPERATOR", yytext); }
  25. \<=|\>=|\<|==|\> { if (!COMMENT) printf("\n\t%s is a RELATIONAL OPERATOR", yytext); }
  26. %%
  27.  
  28. int main(int argc, char **argv) {
  29.     if (argc > 1) {
  30.         FILE *file;
  31.         file = fopen(argv[1], "r");
  32.         if (!file) {
  33.             printf("Could not open %s\n", argv[1]);
  34.             exit(0);
  35.         }
  36.         yyin = file;
  37.     }
  38.     yylex();
  39.     printf("\n\nTotal No. of comments are %d", cnt);
  40.     return 0;
  41. }
  42.  
  43. int yywrap() {
  44.     return 1;
  45. }
  46.  
Success #stdin #stdout #stderr 0.02s 7020KB
comments (?)
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/LbOEhi/prog:45:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/k87WbI
language:
Prolog (swi 7.6.4)
created:
22 hours ago
visibility:
public

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