I wrote this code and it shows so many errors can someone please help me with the code and explain the errors. Its a C++ code. Thank you in advance for the great help

/* 8. Create a Patron class for the library. The class will have a users name, library card number,

and library fees (if owed). Have functions that access this data, as well as a function to set the fee of the user.

Have a helper function that returns a Boolean (bool) depending on whether or not the user owes a fee.*/

#include "std_lib_facilities_4.h"

#include

class Patron {

private:

string name1;

double card;

double fees;

public:

string getname();

double getcard();

double getfees();

bool isfee();

void set_name(string n);

void set_card(double m);

void set_fees(double f);

Patron(){

name1 = "H" ; card = 0; fees=0;

}

Patron(string n, double c,double f){

name1 = n ; card = c; fees=f;

}

};

string Patron::getname(){

return name1;

}

void Patron :: set_name(string n) {

name1=n;

}

void Patron :: set_card(double m){

card=m;

}

void Patron :: set_fees(double f){

fees=f;

}

double Patron::getcard(){

return card;

}

double Patron :: getfees() {

return fees;

}

bool Patron:: isfee(){

if (fees > '0'){

return true;}

return false;

}

bool operator==(const Patron& a1, const Patron& b1 ) {

return (a1.getfees()==b1.getfees());

}

ostream& operate << (ostream& os , const Patron& d ){

return os << "User Name "<< d.get_username()<

}

int main(){

Patron a1{"H1",5,1};

Patron b1{"YYYY ",7,10};

a1.Patron::set_fees(10);

cout<<"Is there a fee :" << a1.Patron::isfee()<

cout<<"Fee is : "<

cout<<"Is there a fee :" << a1.Patron::isfee()<

cout<<"Fee is : "<

bool mmm=a1==b1;

cout<

cout<

return 0;

}