cannot convert 'char*' to 'float' in assignment flex/bison

Question

i am making a programming language using bison/flex but i get errors i just found a simple programming language tutorial in dev.to then made some changes now im making a variable system or anything else. but i get a error

how the variable should look like:

the end is just example but i want the first one to work; i done the lexer with no error

varX = 5

varX + 3

In file included from scanner.l:3:
parser.y: In function 'int yyparse()':
parser.y:38:36: error: cannot convert 'char*' to 'float' in assignment
   38 |   | VAR        { $$ = $1; }

and my parser.y code:

%{
  #include <iostream>
  #include <string>
  #include <vector>
  using namespace std;
  extern "C" void yyerror(char *s);
  extern "C" int yyparse();
%}

%union{
  char* stringVal;
  int intVal;
  float floatVal;
}

%start program

%token <intVal> INTEGER_LITERAL
%token <floatVal> FLOAT_LITERAL
%token <stringVal> VAR
%token EQUALS
%token SEMI
%type <floatVal> exp
%type <floatVal> statement
%left PLUS MINUS
%left MULT DIV

%%
program: /* empty */
    | program statement { cout << "" << $2 << endl; }
    ;

statement: exp SEMI

exp:
    INTEGER_LITERAL { $$ = $1; }
    | FLOAT_LITERAL { $$ = $1; }
  | VAR        { $$ = $1; }
    | exp PLUS exp  { $$ = $1 + $3; }
    | exp MINUS exp { $$ = $1 - $3; }
    | exp MULT exp  { $$ = $1 * $3; }
    | exp DIV exp   { $$ = $1 / $3; }
    ;
%%
int main(int argc, char **argv) {
  if (argc < 2) {
    cout << "Provide a filename to parse!" << endl;
    exit(1);
  }
  FILE *sourceFile = fopen(argv[1], "r");

  if (!sourceFile) {
    cout << "Could not open source file " << argv[1] << endl;
    exit(1);
  }

  yyin = sourceFile;
  yyparse();
}

void yyerror(char *s) {
  cerr << s << endl;
}