[A-Za-z][0-9]
%{
  #include<stdio.h>
  int kcount=0,count=0,dcount=0,ocount;
%}
 
%%
 
int|float|doubl|if|else {printf("%s is an keyword",yytext); kcount++;}
\+|\-|\*|\% {printf("%s is an operator",yytext); ocount++;}
\(|\)|\.|\{|\}|\;|\, {printf("%s is a delimiter",yytext);dcount++;}
{letter}|{(letter|digit)}*{printf("%s is a identifier",yytext);count++;}
%%
 
int main()
{
  yylex();
  printf("No of keyword ",kcount);
  printf("No of operator ",ocount);
  printf("No of delimiter "dcount);
  printf("No of identifier ",count);
}

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aW50IGE9YitjOw==

int a=b+c;