%{
  #include<stdio.h>
  int op=0,id=0,flag=0,p=0;
%}
%%
"(" {p++;}
")" {if(p>0){
  p--;
}
else{
  flag=1;
}}
[0-9]+ {id++; printf("%s is an identifier\n",yytext);}
[+*] {op++; printf("%s is an operator \n",yytext);}
. {flag=1; printf("%s is a chracter \n",yytext);}
%%
 
int main(){
  printf("Enter an expression");
  yylex();
 
  if(id==op+1 && p==0 && flag==0){
    printf("Valid expreesion");
    printf("Number of Identifiers %d \n No of operator %d\n",id,op);
  }
  else{
    printf("Invalid expression");
  }
}

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