%{
  int count = 0; int lineno = 1;
%}

%%
[a-zA-Z][a-zA-Z0-9_]*   {printf("(T_ident, %s)\n", yytext); count++;}
[0-9]+   {printf("(T_num, %s)\n", yytext); count++;}
[=]   {printf("(T_assign, %s)\n", yytext); count++;}
[+]   {printf("(T_OP, %s)\n", yytext); count++;}
[-]   {printf("(T_OP, %s)\n", yytext); count++;}
[*]   {printf("(T_OP, %s)\n", yytext); count++;}
[/]   {printf("(T_OP, %s)\n", yytext); count++;}
[<]   {printf("(T_OP, %s)\n", yytext); count++;}
[>]   {printf("(T_OP, %s)\n", yytext); count++;}
[;]   {printf("(T_SemiC, %s)\n", yytext); count++;}
[(]   {printf("(T_OpenPar, %s)\n", yytext); count++;}
[)]   {printf("(T_ClosePar, %s)\n", yytext); count++;}
[^\n\t]   {printf("Invalid character: %s at line %d", yytext, lineno);}
[\n]  {lineno++;}
%%


int yywrap(){}

int main(){
  yylex();
  printf("\nNumber of tokens found: %d\n", count);
  return 0;
}