/*Lex code to count total number of tokens */
 
%{
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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a=10 float b=5  >  <