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  1.  
  2.  
  3. /*Lex code to count total number of tokens */
  4.  
  5.  
  6. %{  
  7.  
  8. int n = 0 ;   
  9. %}  
  10.  
  11.  
  12. // rule section 
  13. %%  
  14.  
  15.  
  16. //count number of keywords 
  17.  
  18. "while"|"if"|"else" {n++;printf("\t keywords : %s", yytext);}   
  19.  
  20.  
  21. // count number of keywords 
  22.  
  23. "int"|"float" {n++;printf("\t keywords : %s", yytext);}    
  24.  
  25.  
  26. // count number of identifiers 
  27.  
  28. [a-zA-Z_][a-zA-Z0-9_]* {n++;printf("\t identifier : %s", yytext);}  
  29.  
  30.  
  31. // count number of operators 
  32.  
  33. "<="|"=="|"="|"++"|"-"|"*"|"+" {n++;printf("\t operator : %s", yytext);} 
  34.  
  35.  
  36. // count number of separators 
  37.  
  38. [(){}|, ;]    {n++;printf("\t separator : %s", yytext);}  
  39.  
  40.  
  41. // count number of floats 
  42.  
  43. [0-9]*"."[0-9]+ {n++;printf("\t float : %s", yytext);}   
  44.  
  45.  
  46. // count number of integers 
  47.  
  48. [0-9]+ {n++;printf("\t integer : %s", yytext);}                         
  49.  
  50.  
  51. .    ; 
  52. %%  
  53.  
  54.  
  55.  
  56.  
  57.  
  58. int main()  
  59.  
  60.  
  61. {  
  62.  
  63.  
  64.  
  65.     yylex(); 
  66.  
  67.  
  68.  
  69.     printf("\n total no. of token = %d\n", n);    
  70.  
  71.  
  72. }
Success #stdin #stdout #stderr 0.02s 6968KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
ERROR: /home/ghOkGM/prog:8:4: Syntax error: Operator expected
ERROR: /home/ghOkGM/prog:72:2: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/nxp53J
language:
Prolog (swi 7.6.4)
created:
2 years ago
visibility:
public

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