%{  
int n = 0 ;   
%}  
 
// rule section 
%%  
 
//count number of keywords 
"while"|"if"|"else" {n++;printf("\t keywords : %s", yytext);}   
 
// count number of keywords 
"int"|"float" {n++;printf("\t keywords : %s", yytext);}    
 
// count number of identifiers 
[a-zA-Z_][a-zA-Z0-9_]* {n++;printf("\t identifier : %s", yytext);}  
 
// count number of operators 
"<="|"=="|"="|"++"|"-"|"*"|"+" {n++;printf("\t operator : %s", yytext);} 
 
// count number of separators 
[(){}|, ;]    {n++;printf("\t separator : %s", yytext);}  
 
// count number of floats 
[0-9]*"."[0-9]+ {n++;printf("\t float : %s", yytext);}   
 
// count number of integers 
[0-9]+ {n++;printf("\t integer : %s", yytext);}                         
 
.    ; 
%%  
 
 
int main()  
 
{  
 
    yylex(); 
 
    printf("\n total no. of token = %d\n", n);    
 
}  

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