MenuStream, C++ (gcc)

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//g++  7.4.0

////////////////////////////////////////////////////////////////////////////////MenuStream
//
//this code is created by Rezaul Hoque on August 02,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com

//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;

#include <iostream>
#include <sstream>
#include <string>

//stream manipulator
std::ostream& l(std::ostream& os)
{
  return (os<<"\n");
}

void fill(char c)
{
std::cout.width(40);
std::cout.fill(c);
std::cout<<l;
}

class Menu{
friend std::istream & operator>>(std::istream& istr,Menu& in);//input operator
friend std::ostream & operator<<(std::ostream& ostr ,const Menu& print);//output operator

int p,q,t;

public:
Menu (){}//default constructor
Menu (int mp,int mq){ p=mp;q=mq;}//Menu(int,int ) constructor
Menu (const Menu& c){p=c.p; q=c.q;}//copy constructor

Menu& operator=(const Menu& eq){ p=eq.p; q=eq.q; return *this;}//assignment operator
int& operator[](int);//subscript operator

double  total(){return p*q;}
};

std::istream & operator>>(std::istream & istr,Menu& in)
{
std::cout<<"\nprice: \n"; istr>>in.p;
std::cout<<"\nquantity:\n"; istr>>in.q;
return istr;
}

std::ostream & operator<<(std::ostream & ostr,const Menu& print)
{
ostr<<"\nprice:\n"<<print.p<<"\nquantity:\n"<<print.q;
return ostr;
}

int main()
{
fill('@');
std::stringstream s("Example of stream");
s.seekp(0,std::ios::end);
s<<" operator overloading";
std::cout<<s.str()<<l;
fill('-');
fill('-');
Menu x,y,z;

std::cin>>x>>y;
z=y;
std::cout<<"X:"<<l<<x<<l<<"Total:"<<l<<x.total()<<"\nY:"<<l<<y<<l<<"Total:"<<l<<z.total()<<l;
fill('-');
fill('-');
fill('@');
return 0;
}

Show compiler warnings [ + ] Compiler args [ - ] Show input
Compilation time: 0.52 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,76 sec