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  1. /* program name is lexp.l */
  2. %{
  3. /* program to recognize a c program */
  4. int COMMENT=0;
  5. int cnt=0;
  6. %}
  7. identifier [a-zA-Z][a-zA-Z0-9]*
  8. %%
  9. #.* { printf("\n%s is a PREPROCESSOR DIRECTIVE",yytext);}
  10. int |
  11. float |
  12. char |
  13. double |
  14. while |
  15. for |
  16. do |
  17. if |
  18. break |
  19. continue |
  20. void |
  21. switch |
  22. case |
  23. long |
  24. struct |
  25. const |
  26. typedef |
  27. return |
  28. else |
  29. goto {printf("\n\t%s is a KEYWORD",yytext);}
  30. "/*" {COMMENT = 1;}
  31. "*/" {COMMENT = 0; cnt++;}
  32. {identifier}\( {if(!COMMENT)printf("\n\nFUNCTION\n\t%s",yytext);}
  33. \{ {if(!COMMENT) printf("\n BLOCK BEGINS");}
  34. \} {if(!COMMENT) printf("\n BLOCK ENDS");}
  35. {identifier}(\[[0-9]*\])? {if(!COMMENT) printf("\n %s IDENTIFIER",yytext);}
  36. \".*\" {if(!COMMENT) printf("\n\t%s is a STRING",yytext);}
  37. [0-9]+ {if(!COMMENT) printf("\n\t%s is a NUMBER",yytext);}
  38. \)(\;)? {if(!COMMENT) printf("\n\t");ECHO;printf("\n");}
  39. \( ECHO;
  40. = {if(!COMMENT)printf("\n\t%s is an ASSIGNMENT OPERATOR",yytext);}
  41. \<= |
  42. \>= |
  43. \< |
  44. == |
  45. \> {if(!COMMENT) printf("\n\t%s is a RELATIONAL OPERATOR",yytext);}
  46. %%
  47. int main(int argc,char **argv)
  48. {
  49. if (argc > 1)
  50. {
  51. FILE *file;
  52. file = fopen(argv[1],"r");
  53. if(!file)
  54. {
  55. printf("could not open %s \n",argv[1]);
  56. exit(0);
  57. }
  58. yyin = file;
  59. }
  60. yylex();
  61. printf("\n\n Total No.Of comments are %d",cnt);
  62. return 0;
  63. }
  64. int yywrap()
  65. {
  66. return 1;
  67.  
  68. }
Success #stdin #stdout #stderr 0.02s 6860KB
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/mgDIrg/prog:68:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/8ad5eA
language:
Prolog (swi 7.6.4)
created:
1 year ago
visibility:
public

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